tidy-up: delete unused build configuration macros

Most of them feature guards:

- `CURL_INCLUDES_SYS_UIO` [1]
- `HAVE_ALLOCA_H` [2]
- `HAVE_CRYPTO_CLEANUP_ALL_EX_DATA` (unused since de71e68000c8624ea13f90b136f8734dd0fb1bdc)
- `HAVE_DLFCN_H`
- `HAVE_DLOPEN`
- `HAVE_DOPRNT`
- `HAVE_FCNTL`
- `HAVE_GETHOSTBYNAME` [3]
- `HAVE_GETOPT_H`
- `HAVE_GETPASS`
- `HAVE_GETPROTOBYNAME`
- `HAVE_GETSERVBYNAME`
- `HAVE_IDN_FREE*`
- `HAVE_INET_ADDR`
- `HAVE_IOCTL`
- `HAVE_KRB4`
- `HAVE_KRB_GET_OUR_IP_FOR_REALM`
- `HAVE_KRB_H`
- `HAVE_LDAPSSL_H`
- `HAVE_LDAP_INIT_FD`
- `HAVE_LIBDL`
- `HAVE_LIBNSL`
- `HAVE_LIBRESOLV*`
- `HAVE_LIBUCB`
- `HAVE_LL`
- `HAVE_LOCALTIME_R`
- `HAVE_MALLOC_H`
- `HAVE_MEMCPY`
- `HAVE_MEMORY_H`
- `HAVE_NETINET_IF_ETHER_H`
- `HAVE_NI_WITHSCOPEID`
- `HAVE_OPENSSL_CRYPTO_H`
- `HAVE_OPENSSL_ERR_H`
- `HAVE_OPENSSL_PEM_H`
- `HAVE_OPENSSL_PKCS12_H`
- `HAVE_OPENSSL_RAND_H`
- `HAVE_OPENSSL_RSA_H`
- `HAVE_OPENSSL_SSL_H`
- `HAVE_OPENSSL_X509_H`
- `HAVE_PEM_H`
- `HAVE_POLL`
- `HAVE_RAND_SCREEN`
- `HAVE_RAND_STATUS`
- `HAVE_RECVFROM`
- `HAVE_SETSOCKOPT`
- `HAVE_SETVBUF`
- `HAVE_SIZEOF_LONG_DOUBLE`
- `HAVE_SOCKIO_H`
- `HAVE_SOCK_OPTS`
- `HAVE_STDIO_H`
- `HAVE_STRCASESTR`
- `HAVE_STRFTIME`
- `HAVE_STRLCAT`
- `HAVE_STRNCMPI`
- `HAVE_STRNICMP`
- `HAVE_STRSTR`
- `HAVE_STRUCT_IN6_ADDR`
- `HAVE_TLD_H`
- `HAVE_TLD_STRERROR`
- `HAVE_UNAME`
- `HAVE_USLEEP`
- `HAVE_WINBER_H`
- `HAVE_WRITEV`
- `HAVE_X509_H`
- `LT_OBJDIR`
- `NEED_BASENAME_PROTO`
- `NOT_NEED_LIBNSL`
- `OPENSSL_NO_KRB5`
- `RECVFROM_TYPE*`
- `SIZEOF_LONG_DOUBLE`
- `STRERROR_R_TYPE_ARG3`
- `USE_YASSLEMUL`
- `_USRDLL` (from CMake) [4]

[1] Related parts in `m4/curl-functions.m4` and `configure.ac` might
    also be deleted.

[2] Related comment can possibly be deleted in
    `packages/vms/generate_config_vms_h_curl.com`.

[3] There are more instances of this in autotools, but I did not dare to
    touch those. Looked like it's used to detect socket support.

[4] This is necessary for MFC (Microsoft Foundation Class) DLLs to
    force linking MFC components statically to the DLL. `libcurl.dll`
    does not use MFC, so we can delete this define.
    Ref: https://docs.microsoft.com/cpp/build/regular-dlls-statically-linked-to-mfc

Script that can help finding unused settings like above:
```shell

autoheader configure.ac  # generate lib/curl_config.h.in

{
  grep -o -E    'set\([A-Z][A-Z0-9_]{3,}'          CMake/Platforms/WindowsCache.cmake | sed -E 's|set\(||g'
  grep -o -E -h '#define +[A-Z][A-Z0-9_]{3,}'      lib/config-*.h                     | sed -E 's|#define +||g'
  grep -o -E    '#cmakedefine +[A-Z][A-Z0-9_]{3,}' lib/curl_config.h.cmake            | sed -E 's|#cmakedefine +||g'
  grep -o -E    '#undef +[A-Z][A-Z0-9_]{3,}'       lib/curl_config.h.in               | sed -E 's|#undef +||g'
} | sort -u | grep -v -F 'HEADER_CURL_' | while read -r def; do
  c="$(git grep -w -F "${def}" | grep -v -E -c '(/libcurl\.tmpl|^lib/config-|^lib/curl_config\.h\.cmake|^CMakeLists\.txt|^CMake/Platforms/WindowsCache\.cmake|^packages/vms/config_h\.com|^m4/curl-functions\.m4|^acinclude\.m4|^configure\.ac)')"
  if [ "${c}" = '0' ]; then
    echo "${def}"
  fi
done
```

Reviewed-by: Daniel Stenberg
Closes #9044

12 files changed, 1 insertions, 696 deletions

diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 199ab7d37..24226fcd8 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -119,7 +119,6 @@ endif()
 
 if(WIN32)
   if(BUILD_SHARED_LIBS)
-    set_property(TARGET ${LIB_NAME} APPEND PROPERTY COMPILE_DEFINITIONS "_USRDLL")
     if(MSVC)
       # Add "_imp" as a suffix before the extension to avoid conflicting with
       # the statically linked "libcurl.lib"
diff --git a/lib/config-amigaos.h b/lib/config-amigaos.h
index 79186c637..1615a1c53 100644
--- a/lib/config-amigaos.h
+++ b/lib/config-amigaos.h
@@ -33,26 +33,16 @@
 #define HAVE_ARPA_INET_H 1
 #define HAVE_CLOSESOCKET_CAMEL 1
 #define HAVE_ERRNO_H 1
-#define HAVE_INET_ADDR 1
 #define HAVE_INTTYPES_H 1
 #define HAVE_IOCTLSOCKET_CAMEL 1
 #define HAVE_IOCTLSOCKET_CAMEL_FIONBIO 1
 #define HAVE_LIBZ 1
 #define HAVE_LONGLONG 1
-#define HAVE_MALLOC_H 1
-#define HAVE_MEMORY_H 1
 #define HAVE_NETDB_H 1
 #define HAVE_NETINET_IN_H 1
 #define HAVE_NET_IF_H 1
-#define HAVE_OPENSSL_CRYPTO_H 1
-#define HAVE_OPENSSL_ERR_H 1
-#define HAVE_OPENSSL_PEM_H 1
-#define HAVE_OPENSSL_RSA_H 1
-#define HAVE_OPENSSL_SSL_H 1
-#define HAVE_OPENSSL_X509_H 1
 #define HAVE_PWD_H 1
 #define HAVE_RAND_EGD 1
-#define HAVE_RAND_STATUS 1
 #define HAVE_SELECT 1
 #define HAVE_SETJMP_H 1
 #define HAVE_SIGNAL 1
@@ -60,11 +50,9 @@
 #define HAVE_SOCKET 1
 #define HAVE_STRCASECMP 1
 #define HAVE_STRDUP 1
-#define HAVE_STRFTIME 1
 #define HAVE_STRICMP 1
 #define HAVE_STRINGS_H 1
 #define HAVE_STRING_H 1
-#define HAVE_STRSTR 1
 #define HAVE_STRUCT_TIMEVAL 1
 #define HAVE_SYS_PARAM_H 1
 #define HAVE_SYS_SOCKET_H 1
@@ -73,7 +61,6 @@
 #define HAVE_SYS_TIME_H 1
 #define HAVE_SYS_TYPES_H 1
 #define HAVE_TIME_H 1
-#define HAVE_UNAME 1
 #define HAVE_UNISTD_H 1
 #define HAVE_UTIME 1
 #define HAVE_UTIME_H 1
@@ -133,15 +120,6 @@
 #define RECV_TYPE_ARG4 long
 #define RECV_TYPE_RETV long
 
-#define HAVE_RECVFROM 1
-#define RECVFROM_TYPE_ARG1 long
-#define RECVFROM_TYPE_ARG2 char
-#define RECVFROM_TYPE_ARG3 long
-#define RECVFROM_TYPE_ARG4 long
-#define RECVFROM_TYPE_ARG5 struct sockaddr
-#define RECVFROM_TYPE_ARG6 long
-#define RECVFROM_TYPE_RETV long
-
 #define HAVE_SEND 1
 #define SEND_TYPE_ARG1 int
 #define SEND_QUAL_ARG2 const
diff --git a/lib/config-dos.h b/lib/config-dos.h
index 9fb774395..2aadc4172 100644
--- a/lib/config-dos.h
+++ b/lib/config-dos.h
@@ -45,23 +45,19 @@
 #define HAVE_FCNTL_H           1
 #define HAVE_FREEADDRINFO      1
 #define HAVE_GETADDRINFO       1
-#define HAVE_GETPROTOBYNAME    1
 #define HAVE_GETTIMEOFDAY      1
 #define HAVE_IO_H              1
-#define HAVE_IOCTL             1
 #define HAVE_IOCTL_FIONBIO     1
 #define HAVE_IOCTLSOCKET       1
 #define HAVE_IOCTLSOCKET_FIONBIO   1
 #define HAVE_LOCALE_H          1
 #define HAVE_LONGLONG          1
-#define HAVE_MEMORY_H          1
 #define HAVE_NETDB_H           1
 #define HAVE_NETINET_IN_H      1
 #define HAVE_NETINET_TCP_H     1
 #define HAVE_NET_IF_H          1
 #define HAVE_PROCESS_H         1
 #define HAVE_RECV              1
-#define HAVE_RECVFROM          1
 #define HAVE_SELECT            1
 #define HAVE_SEND              1
 #define HAVE_SETJMP_H          1
@@ -73,7 +69,6 @@
 #define HAVE_STRICMP           1
 #define HAVE_STRTOLL           1
 #define HAVE_STRUCT_TIMEVAL    1
-#define HAVE_STRUCT_IN6_ADDR   1
 #define HAVE_SYS_IOCTL_H       1
 #define HAVE_SYS_SOCKET_H      1
 #define HAVE_SYS_STAT_H        1
@@ -85,14 +80,13 @@
 
 #define SIZEOF_INT             4
 #define SIZEOF_LONG            4
-#define SIZEOF_LONG_DOUBLE     16
 #define SIZEOF_SHORT           2
 #define SIZEOF_SIZE_T          4
 #define SIZEOF_CURL_OFF_T      4
 #define STDC_HEADERS           1
 #define TIME_WITH_SYS_TIME     1
 
-/* Qualifiers for send(), recv(), and recvfrom() */
+/* Qualifiers for send() and recv() */
 
 #define SEND_TYPE_ARG1         int
 #define SEND_QUAL_ARG2         const
@@ -107,15 +101,6 @@
 #define RECV_TYPE_ARG4         int
 #define RECV_TYPE_RETV         int
 
-#define RECVFROM_TYPE_ARG1     int
-#define RECVFROM_TYPE_ARG2     void
-#define RECVFROM_TYPE_ARG3     int
-#define RECVFROM_TYPE_ARG4     int
-#define RECVFROM_TYPE_ARG5     struct sockaddr
-#define RECVFROM_TYPE_ARG6     int
-#define RECVFROM_TYPE_RETV     int
-#define RECVFROM_TYPE_ARG2_IS_VOID 1
-
 #define BSD
 
 /* CURLDEBUG definition enables memory tracking */
@@ -127,12 +112,6 @@
   #define HAVE_LIBZ              1
 #endif
 
-/* USE_OPENSSL on cmd-line */
-#ifdef USE_OPENSSL
-  #define HAVE_CRYPTO_CLEANUP_ALL_EX_DATA 1
-  #define OPENSSL_NO_KRB5        1
-#endif
-
 /* to disable LDAP */
 #define CURL_DISABLE_LDAP        1
 
diff --git a/lib/config-mac.h b/lib/config-mac.h
index dd1d9a7ea..4928866b1 100644
--- a/lib/config-mac.h
+++ b/lib/config-mac.h
@@ -47,7 +47,6 @@
 #define HAVE_GETTIMEOFDAY       1
 #define HAVE_FCNTL_H            1
 #define HAVE_SYS_STAT_H         1
-#define HAVE_ALLOCA_H           1
 #define HAVE_STDLIB_H           1
 #define HAVE_TIME_H             1
 #define HAVE_UTIME_H            1
@@ -59,10 +58,6 @@
 #define HAVE_ALARM              1
 #define HAVE_FTRUNCATE          1
 #define HAVE_UTIME              1
-#define HAVE_SETVBUF            1
-#define HAVE_STRFTIME           1
-#define HAVE_INET_ADDR          1
-#define HAVE_MEMCPY             1
 #define HAVE_SELECT             1
 #define HAVE_SOCKET             1
 #define HAVE_STRUCT_TIMEVAL     1
@@ -76,10 +71,8 @@
 
 #define CURL_DISABLE_LDAP       1
 
-#define HAVE_RAND_STATUS        1
 #define HAVE_RAND_EGD           1
 
-#define HAVE_IOCTL              1
 #define HAVE_IOCTL_FIONBIO      1
 
 #define SIZEOF_INT              4
@@ -93,16 +86,6 @@
 #define RECV_TYPE_ARG4 int
 #define RECV_TYPE_RETV ssize_t
 
-#define HAVE_RECVFROM 1
-#define RECVFROM_TYPE_ARG1 int
-#define RECVFROM_TYPE_ARG2 void
-#define RECVFROM_TYPE_ARG3 size_t
-#define RECVFROM_TYPE_ARG4 int
-#define RECVFROM_TYPE_ARG5 struct sockaddr
-#define RECVFROM_TYPE_ARG6 int
-#define RECVFROM_TYPE_RETV ssize_t
-#define RECVFROM_TYPE_ARG2_IS_VOID 1
-
 #define HAVE_SEND 1
 #define SEND_TYPE_ARG1 int
 #define SEND_QUAL_ARG2 const
diff --git a/lib/config-os400.h b/lib/config-os400.h
index f6113fc69..205432fad 100644
--- a/lib/config-os400.h
+++ b/lib/config-os400.h
@@ -35,9 +35,6 @@
 /* Version number of this archive. */
 #undef VERSION
 
-/* Define if you have the getpass function.  */
-#undef HAVE_GETPASS
-
 /* Define cpu-machine-OS */
 #define OS "OS/400"
 
@@ -57,9 +54,6 @@
 /* Define if you need the _REENTRANT define for some functions */
 #undef NEED_REENTRANT
 
-/* Define if you have the Kerberos4 libraries (including -ldes) */
-#undef HAVE_KRB4
-
 /* Define if you want to enable IPv6 support */
 #define ENABLE_IPV6
 
@@ -78,9 +72,6 @@
 /* Define to 1 if you have the alarm function. */
 #define HAVE_ALARM 1
 
-/* Define if you have the <alloca.h> header file. */
-#undef HAVE_ALLOCA_H
-
 /* Define if you have the <arpa/inet.h> header file. */
 #define HAVE_ARPA_INET_H
 
@@ -99,9 +90,6 @@
 /* Define if you have the `gethostname' function. */
 #define HAVE_GETHOSTNAME
 
-/* Define if you have the <getopt.h> header file. */
-#undef HAVE_GETOPT_H
-
 /* Define if you have the `getpass_r' function. */
 #undef HAVE_GETPASS_R
 
@@ -111,9 +99,6 @@
 /* Define if you have the `getpwuid' function. */
 #define HAVE_GETPWUID
 
-/* Define if you have the `getservbyname' function. */
-#define HAVE_GETSERVBYNAME
-
 /* Define to 1 if you have the getsockname function. */
 #define HAVE_GETSOCKNAME 1
 
@@ -123,30 +108,12 @@
 /* Define if you have the `timeval' struct. */
 #define HAVE_STRUCT_TIMEVAL
 
-/* Define if you have the `inet_addr' function. */
-#define HAVE_INET_ADDR
-
 /* Define if you have the <inttypes.h> header file. */
 #define HAVE_INTTYPES_H
 
 /* Define if you have the <io.h> header file. */
 #undef HAVE_IO_H
 
-/* Define if you have the `krb_get_our_ip_for_realm' function. */
-#undef HAVE_KRB_GET_OUR_IP_FOR_REALM
-
-/* Define if you have the <krb.h> header file. */
-#undef HAVE_KRB_H
-
-/* Define if you have the `nsl' library (-lnsl). */
-#undef HAVE_LIBNSL
-
-/* Define if you have the `resolv' library (-lresolv). */
-#undef HAVE_LIBRESOLV
-
-/* Define if you have the `resolve' library (-lresolve). */
-#undef HAVE_LIBRESOLVE
-
 /* Define if you have the `socket' library (-lsocket). */
 #undef HAVE_LIBSOCKET
 
@@ -162,72 +129,27 @@
 /* Define if you have the MIT gssapi libraries */
 #undef HAVE_GSSMIT
 
-/* Define if you have the `ucb' library (-lucb). */
-#undef HAVE_LIBUCB
-
-/* Define if you have the `localtime_r' function. */
-#define HAVE_LOCALTIME_R
-
-/* Define if you have the <malloc.h> header file. */
-#define HAVE_MALLOC_H
-
 /* Define if you need the malloc.h header file even with stdlib.h  */
 /* #define NEED_MALLOC_H 1 */
 
-/* Define if you have the <memory.h> header file. */
-#undef HAVE_MEMORY_H
-
 /* Define if you have the <netdb.h> header file. */
 #define HAVE_NETDB_H
 
-/* Define if you have the <netinet/if_ether.h> header file. */
-#undef HAVE_NETINET_IF_ETHER_H
-
 /* Define if you have the <netinet/in.h> header file. */
 #define HAVE_NETINET_IN_H
 
 /* Define if you have the <net/if.h> header file. */
 #define HAVE_NET_IF_H
 
-/* Define if you have the <openssl/crypto.h> header file. */
-#undef HAVE_OPENSSL_CRYPTO_H
-
-/* Define if you have the <openssl/err.h> header file. */
-#undef HAVE_OPENSSL_ERR_H
-
-/* Define if you have the <openssl/pem.h> header file. */
-#undef HAVE_OPENSSL_PEM_H
-
-/* Define if you have the <openssl/rsa.h> header file. */
-#undef HAVE_OPENSSL_RSA_H
-
-/* Define if you have the <openssl/ssl.h> header file. */
-#undef HAVE_OPENSSL_SSL_H
-
-/* Define if you have the <openssl/x509.h> header file. */
-#undef HAVE_OPENSSL_X509_H
-
-/* Define if you have the <pem.h> header file. */
-#undef HAVE_PEM_H
-
 /* Define if you have the <pwd.h> header file. */
 #define HAVE_PWD_H
 
 /* Define if you have the `RAND_egd' function. */
 #undef HAVE_RAND_EGD
 
-/* Define if you have the `RAND_screen' function. */
-#undef HAVE_RAND_SCREEN
-
-/* Define if you have the `RAND_status' function. */
-#undef HAVE_RAND_STATUS
-
 /* Define if you have the `select' function. */
 #define HAVE_SELECT
 
-/* Define if you have the `setvbuf' function. */
-#define HAVE_SETVBUF
-
 /* Define if you have the `sigaction' function. */
 #define HAVE_SIGACTION
 
@@ -266,10 +188,6 @@
 /* Define if you have the `strdup' function. */
 #define HAVE_STRDUP
 
-
-/* Define if you have the `strftime' function. */
-#define HAVE_STRFTIME
-
 /* Define if you have the <strings.h> header file. */
 #define HAVE_STRINGS_H
 
@@ -279,9 +197,6 @@
 /* Define if you have the <stropts.h> header file. */
 #undef HAVE_STROPTS_H
 
-/* Define if you have the `strstr' function. */
-#define HAVE_STRSTR
-
 /* Define if you have the `strtok_r' function. */
 #define HAVE_STRTOK_R
 
@@ -324,24 +239,15 @@
 /* Define if you have the <time.h> header file. */
 #define HAVE_TIME_H
 
-/* Define if you have the `uname' function. */
-#undef HAVE_UNAME
-
 /* Define if you have the <unistd.h> header file. */
 #define HAVE_UNISTD_H
 
-/* Define if you have the <x509.h> header file. */
-#undef HAVE_X509_H
-
 /* Name of package */
 #undef PACKAGE
 
 /* The size of `int', as computed by sizeof. */
 #define SIZEOF_INT              4
 
-/* The size of a `long double', as computed by sizeof. */
-#define SIZEOF_LONG_DOUBLE      8
-
 /* Define if the compiler supports the 'long long' data type. */
 #define HAVE_LONGLONG
 
@@ -360,10 +266,6 @@
 /* The size of `curl_off_t', as computed by sizeof. */
 #define SIZEOF_CURL_OFF_T       8
 
-/* Whether long long constants must be suffixed by LL. */
-
-#define HAVE_LL
-
 /* Define this if you have struct sockaddr_storage */
 #define HAVE_STRUCT_SOCKADDR_STORAGE
 
@@ -395,9 +297,6 @@
 /* Define to `unsigned' if <sys/types.h> does not define. */
 #undef size_t
 
-/* Define if you have the ioctl function. */
-#define HAVE_IOCTL
-
 /* Define if you have a working ioctl FIONBIO function. */
 #define HAVE_IOCTL_FIONBIO
 
@@ -431,30 +330,6 @@
 /* Define to the function return type for recv. */
 #define RECV_TYPE_RETV int
 
-/* Define if you have the recvfrom function. */
-#define HAVE_RECVFROM
-
-/* Define to the type of arg 1 for recvfrom. */
-#define RECVFROM_TYPE_ARG1 int
-
-/* Define to the type pointed by arg 2 for recvfrom. */
-#define RECVFROM_TYPE_ARG2 char
-
-/* Define to the type of arg 3 for recvfrom. */
-#define RECVFROM_TYPE_ARG3 int
-
-/* Define to the type of arg 4 for recvfrom. */
-#define RECVFROM_TYPE_ARG4 int
-
-/* Define to the type pointed by arg 5 for recvfrom. */
-#define RECVFROM_TYPE_ARG5 struct sockaddr
-
-/* Define to the type pointed by arg 6 for recvfrom. */
-#define RECVFROM_TYPE_ARG6 int
-
-/* Define to the function return type for recvfrom. */
-#define RECVFROM_TYPE_RETV int
-
 /* Define if you have the send function. */
 #define HAVE_SEND
 
diff --git a/lib/config-plan9.h b/lib/config-plan9.h
index 75aac7272..4e4a4bd30 100644
--- a/lib/config-plan9.h
+++ b/lib/config-plan9.h
@@ -63,18 +63,6 @@
 #define RECV_TYPE_ARG4 int
 #define RECV_TYPE_RETV int
 
-#define HAVE_RECVFROM 1
-#define RECVFROM_TYPE_ARG1 int
-#define RECVFROM_TYPE_ARG2 void
-#define RECVFROM_TYPE_ARG2_IS_VOID 1
-#define RECVFROM_TYPE_ARG3 int
-#define RECVFROM_TYPE_ARG4 int
-#define RECVFROM_TYPE_ARG5 void
-#define RECVFROM_TYPE_ARG5_IS_VOID 1
-#define RECVFROM_TYPE_ARG6 int
-#define RECVFROM_TYPE_ARG6_IS_VOID 1
-#define RECVFROM_TYPE_RETV int
-
 #define HAVE_SELECT 1
 #define SELECT_TYPE_ARG1 int
 #define SELECT_TYPE_ARG234 fd_set *
@@ -94,7 +82,6 @@
 #define HAVE_ASSERT_H 1
 #define HAVE_BASENAME 1
 #define HAVE_BOOL_T 1
-#define HAVE_CRYPTO_CLEANUP_ALL_EX_DATA 1
 #define HAVE_ERRNO_H 1
 #define HAVE_FCNTL 1
 #define HAVE_FCNTL_H 1
@@ -102,23 +89,17 @@
 #define HAVE_FTRUNCATE 1
 #define HAVE_GETADDRINFO 1
 #define HAVE_GETEUID 1
-#define HAVE_GETHOSTBYNAME 1
 #define HAVE_GETHOSTNAME 1
 #define HAVE_GETPPID 1
-#define HAVE_GETPROTOBYNAME 1
 #define HAVE_GETPWUID 1
 #define HAVE_GETTIMEOFDAY 1
 #define HAVE_GMTIME_R 1
-#define HAVE_INET_ADDR 1
 #define HAVE_INET_NTOP 1
 #define HAVE_INET_PTON 1
 #define HAVE_INTTYPES_H 1
-#define HAVE_IOCTL 1
 #define HAVE_LIBGEN_H 1
 #define HAVE_LIBZ 1
-#define HAVE_LL 1
 #define HAVE_LOCALE_H 1
-#define HAVE_LOCALTIME_R 1
 #define HAVE_LONGLONG 1
 #define HAVE_NETDB_H 1
 #define HAVE_NETINET_IN_H 1
@@ -127,26 +108,14 @@
 #define HAVE_SYS_SELECT_H 1
 
 #define USE_OPENSSL 1
-#define HAVE_OPENSSL_CRYPTO_H 1
-#define HAVE_OPENSSL_ERR_H 1
-#define HAVE_OPENSSL_PEM_H 1
-#define HAVE_OPENSSL_PKCS12_H 1
-#define HAVE_OPENSSL_RSA_H 1
-#define HAVE_OPENSSL_SSL_H 1
-#define HAVE_OPENSSL_X509_H 1
 
 #define HAVE_PIPE 1
-#define HAVE_POLL 1
 #define HAVE_POLL_FINE 1
 #define HAVE_POLL_H 1
 #define HAVE_PTHREAD_H 1
-#define HAVE_RAND_STATUS 1
 #define HAVE_SETJMP_H 1
 #define HAVE_SETLOCALE 1
 
-#define HAVE_SETSOCKOPT 1
-#define HAVE_SOCK_OPTS 1 /* for /sys/include/ape/sys/socket.h */
-
 #define HAVE_SIGACTION 1
 #define HAVE_SIGNAL 1
 #define HAVE_SIGNAL_H 1
@@ -156,12 +125,10 @@
 #define HAVE_SSL_GET_SHUTDOWN 1
 #define HAVE_STDBOOL_H 1
 #define HAVE_STDINT_H 1
-#define HAVE_STDIO_H 1
 #define HAVE_STDLIB_H 1
 #define HAVE_STRCASECMP 1
 #define HAVE_STRDUP 1
 #define HAVE_STRING_H 1
-#define HAVE_STRSTR 1
 #define HAVE_STRTOK_R 1
 #define HAVE_STRTOLL 1
 #define HAVE_STRUCT_TIMEVAL 1
@@ -172,21 +139,17 @@
 #define HAVE_SYS_STAT_H 1
 #define HAVE_SYS_TIME_H 1
 #define HAVE_SYS_TYPES_H 1
-#define HAVE_SYS_UIO_H 1
 #define HAVE_SYS_UN_H 1
 #define HAVE_TERMIOS_H 1
 #define HAVE_TIME_H 1
-#define HAVE_UNAME 1
 #define HAVE_UNISTD_H 1
 #define HAVE_UTIME 1
 #define HAVE_UTIME_H 1
-#define HAVE_WRITEV 1
 
 #define HAVE_ZLIB_H 1
 
 #define HAVE_POSIX_STRERROR_R 1
 #define HAVE_STRERROR_R 1
-#define STRERROR_R_TYPE_ARG3 int
 
 #define TIME_WITH_SYS_TIME 1
 #define USE_MANUAL 1
diff --git a/lib/config-riscos.h b/lib/config-riscos.h
index 383656240..71a67b0e1 100644
--- a/lib/config-riscos.h
+++ b/lib/config-riscos.h
@@ -34,9 +34,6 @@
 /* Version number of this archive. */
 #undef VERSION
 
-/* Define if you have the getpass function.  */
-#undef HAVE_GETPASS
-
 /* Define cpu-machine-OS */
 #define OS "ARM-RISC OS"
 
@@ -55,9 +52,6 @@
 /* Define if you need the _REENTRANT define for some functions */
 #undef NEED_REENTRANT
 
-/* Define if you have the Kerberos4 libraries (including -ldes) */
-#undef HAVE_KRB4
-
 /* Define if you want to enable IPv6 support */
 #undef ENABLE_IPV6
 
@@ -79,9 +73,6 @@
 /* Define if you have the alarm function. */
 #define HAVE_ALARM
 
-/* Define if you have the <alloca.h> header file. */
-#define HAVE_ALLOCA_H
-
 /* Define if you have the <arpa/inet.h> header file. */
 #define HAVE_ARPA_INET_H
 
@@ -109,117 +100,48 @@
 /* Define if you have the `gethostname' function. */
 #define HAVE_GETHOSTNAME
 
-/* Define if you have the <getopt.h> header file. */
-#define HAVE_GETOPT_H
-
 /* Define if you have the `getpass_r' function. */
 #undef HAVE_GETPASS_R
 
 /* Define if you have the `getpwuid' function. */
 #undef HAVE_GETPWUID
 
-/* Define if you have the `getservbyname' function. */
-#undef HAVE_GETSERVBYNAME
-
 /* Define if you have the `gettimeofday' function. */
 #define HAVE_GETTIMEOFDAY
 
 /* Define if you have the `timeval' struct. */
 #define HAVE_STRUCT_TIMEVAL
 
-/* Define if you have the `inet_addr' function. */
-#undef HAVE_INET_ADDR
-
 /* Define if you have the <inttypes.h> header file. */
 #define HAVE_INTTYPES_H
 
 /* Define if you have the <io.h> header file. */
 #undef HAVE_IO_H
 
-/* Define if you have the `krb_get_our_ip_for_realm' function. */
-#undef HAVE_KRB_GET_OUR_IP_FOR_REALM
-
-/* Define if you have the <krb.h> header file. */
-#undef HAVE_KRB_H
-
-/* Define if you have the `nsl' library (-lnsl). */
-#undef HAVE_LIBNSL
-
-/* Define if you have the `resolv' library (-lresolv). */
-#undef HAVE_LIBRESOLV
-
-/* Define if you have the `resolve' library (-lresolve). */
-#undef HAVE_LIBRESOLVE
-
 /* Define if you have the `socket' library (-lsocket). */
 #undef HAVE_LIBSOCKET
 
-/* Define if you have the `ucb' library (-lucb). */
-#undef HAVE_LIBUCB
-
-/* Define if you have the `localtime_r' function. */
-#undef HAVE_LOCALTIME_R
-
-/* Define if you have the <malloc.h> header file. */
-#define HAVE_MALLOC_H
-
 /* Define if you need the malloc.h header file even with stdlib.h  */
 /* #define NEED_MALLOC_H 1 */
 
-/* Define if you have the <memory.h> header file. */
-#undef HAVE_MEMORY_H
-
 /* Define if you have the <netdb.h> header file. */
 #define HAVE_NETDB_H
 
-/* Define if you have the <netinet/if_ether.h> header file. */
-#undef HAVE_NETINET_IF_ETHER_H
-
 /* Define if you have the <netinet/in.h> header file. */
 #define HAVE_NETINET_IN_H
 
 /* Define if you have the <net/if.h> header file. */
 #define HAVE_NET_IF_H
 
-/* Define if you have the <openssl/crypto.h> header file. */
-#undef HAVE_OPENSSL_CRYPTO_H
-
-/* Define if you have the <openssl/err.h> header file. */
-#undef HAVE_OPENSSL_ERR_H
-
-/* Define if you have the <openssl/pem.h> header file. */
-#undef HAVE_OPENSSL_PEM_H
-
-/* Define if you have the <openssl/rsa.h> header file. */
-#undef HAVE_OPENSSL_RSA_H
-
-/* Define if you have the <openssl/ssl.h> header file. */
-#undef HAVE_OPENSSL_SSL_H
-
-/* Define if you have the <openssl/x509.h> header file. */
-#undef HAVE_OPENSSL_X509_H
-
-/* Define if you have the <pem.h> header file. */
-#undef HAVE_PEM_H
-
 /* Define if you have the <pwd.h> header file. */
 #undef HAVE_PWD_H
 
 /* Define if you have the `RAND_egd' function. */
 #undef HAVE_RAND_EGD
 
-/* Define if you have the `RAND_screen' function. */
-#undef HAVE_RAND_SCREEN
-
-/* Define if you have the `RAND_status' function. */
-#undef HAVE_RAND_STATUS
-
 /* Define if you have the `select' function. */
 #define HAVE_SELECT
 
-/* Define if you have the `setvbuf' function. */
-#undef HAVE_SETVBUF
-
 /* Define if you have the `sigaction' function. */
 #undef HAVE_SIGACTION
 
@@ -250,9 +172,6 @@
 /* Define if you have the `strdup' function. */
 #define HAVE_STRDUP
 
-/* Define if you have the `strftime' function. */
-#define HAVE_STRFTIME
-
 /* Define if you have the `stricmp' function. */
 #define HAVE_STRICMP
 
@@ -262,9 +181,6 @@
 /* Define if you have the <string.h> header file. */
 #define HAVE_STRING_H
 
-/* Define if you have the `strstr' function. */
-#define HAVE_STRSTR
-
 /* Define if you have the `strtok_r' function. */
 #undef HAVE_STRTOK_R
 
@@ -301,24 +217,15 @@
 /* Define if you have the <time.h> header file. */
 #undef HAVE_TIME_H
 
-/* Define if you have the `uname' function. */
-#define HAVE_UNAME
-
 /* Define if you have the <unistd.h> header file. */
 #define HAVE_UNISTD_H
 
-/* Define if you have the <x509.h> header file. */
-#undef HAVE_X509_H
-
 /* Name of package */
 #undef PACKAGE
 
 /* The size of `int', as computed by sizeof. */
 #define SIZEOF_INT 4
 
-/* The size of `long double', as computed by sizeof. */
-#undef SIZEOF_LONG_DOUBLE
-
 /* The size of `long long', as computed by sizeof. */
 #undef SIZEOF_LONG_LONG
 
@@ -359,9 +266,6 @@
 /* Define to `int' if <sys/types.h> does not define. */
 #undef ssize_t
 
-/* Define if you have the ioctl function. */
-#define HAVE_IOCTL
-
 /* Define if you have a working ioctl FIONBIO function. */
 #define HAVE_IOCTL_FIONBIO
 
@@ -386,33 +290,6 @@
 /* Define to the function return type for recv. */
 #define RECV_TYPE_RETV ssize_t
 
-/* Define 1 if you have the recvfrom function. */
-#define HAVE_RECVFROM 1
-
-/* Define to the type of arg 1 for recvfrom. */
-#define RECVFROM_TYPE_ARG1 int
-
-/* Define to the type pointed by arg 2 for recvfrom. */
-#define RECVFROM_TYPE_ARG2 void
-
-/* Define if the type pointed by arg 2 for recvfrom is void. */
-#define RECVFROM_TYPE_ARG2_IS_VOID
-
-/* Define to the type of arg 3 for recvfrom. */
-#define RECVFROM_TYPE_ARG3 size_t
-
-/* Define to the type of arg 4 for recvfrom. */
-#define RECVFROM_TYPE_ARG4 int
-
-/* Define to the type pointed by arg 5 for recvfrom. */
-#define RECVFROM_TYPE_ARG5 struct sockaddr
-
-/* Define to the type pointed by arg 6 for recvfrom. */
-#define RECVFROM_TYPE_ARG6 int
-
-/* Define to the function return type for recvfrom. */
-#define RECVFROM_TYPE_RETV ssize_t
-
 /* Define if you have the send function. */
 #define HAVE_SEND 1
 
diff --git a/lib/config-win32.h b/lib/config-win32.h
index 25e81cf19..83484ddbe 100644
--- a/lib/config-win32.h
+++ b/lib/config-win32.h
@@ -44,11 +44,6 @@
 /* Define if you have the <fcntl.h> header file. */
 #define HAVE_FCNTL_H 1
 
-/* Define if you have the <getopt.h> header file. */
-#if defined(__MINGW32__) || defined(__POCC__)
-#define HAVE_GETOPT_H 1
-#endif
-
 /* Define to 1 if you have the <inttypes.h> header file. */
 #if defined(_MSC_VER) && (_MSC_VER >= 1800)
 #define HAVE_INTTYPES_H 1
@@ -165,9 +160,6 @@
 /* Define if you have the closesocket function. */
 #define HAVE_CLOSESOCKET 1
 
-/* Define if you don't have vprintf but do have _doprnt. */
-/* #define HAVE_DOPRNT 1 */
-
 /* Define if you have the ftruncate function. */
 /* #define HAVE_FTRUNCATE 1 */
 
@@ -180,37 +172,15 @@
 /* Define if you have the gethostname function. */
 #define HAVE_GETHOSTNAME 1
 
-/* Define if you have the getpass function. */
-/* #define HAVE_GETPASS 1 */
-
-/* Define if you have the getservbyname function. */
-#define HAVE_GETSERVBYNAME 1
-
-/* Define if you have the getprotobyname function. */
-#define HAVE_GETPROTOBYNAME
-
 /* Define if you have the gettimeofday function. */
 /* #define HAVE_GETTIMEOFDAY 1 */
 
-/* Define if you have the inet_addr function. */
-#define HAVE_INET_ADDR 1
-
 /* Define if you have the ioctlsocket function. */
 #define HAVE_IOCTLSOCKET 1
 
 /* Define if you have a working ioctlsocket FIONBIO function. */
 #define HAVE_IOCTLSOCKET_FIONBIO 1
 
-/* Define if you have the RAND_screen function when using SSL. */
-#define HAVE_RAND_SCREEN 1
-
-/* Define if you have the `RAND_status' function when using SSL. */
-#define HAVE_RAND_STATUS 1
-
-/* Define if you have the `CRYPTO_cleanup_all_ex_data' function.
-   This is present in OpenSSL versions after 0.9.6b */
-#define HAVE_CRYPTO_CLEANUP_ALL_EX_DATA 1
-
 /* Define if you have the select function. */
 #define HAVE_SELECT 1
 
@@ -220,9 +190,6 @@
 /* Define if you have the setmode function. */
 #define HAVE_SETMODE 1
 
-/* Define if you have the setvbuf function. */
-#define HAVE_SETVBUF 1
-
 /* Define if you have the socket function. */
 #define HAVE_SOCKET 1
 
@@ -234,18 +201,9 @@
 /* Define if you have the strdup function. */
 #define HAVE_STRDUP 1
 
-/* Define if you have the strftime function. */
-#define HAVE_STRFTIME 1
-
 /* Define if you have the stricmp function. */
 #define HAVE_STRICMP 1
 
-/* Define if you have the strnicmp function. */
-#define HAVE_STRNICMP 1
-
-/* Define if you have the strstr function. */
-#define HAVE_STRSTR 1
-
 /* Define if you have the strtoll function. */
 #if defined(__MINGW32__) || defined(__POCC__) || \
     (defined(_MSC_VER) && (_MSC_VER >= 1800))
@@ -275,30 +233,6 @@
 /* Define to the function return type for recv. */
 #define RECV_TYPE_RETV int
 
-/* Define if you have the recvfrom function. */
-#define HAVE_RECVFROM 1
-
-/* Define to the type of arg 1 for recvfrom. */
-#define RECVFROM_TYPE_ARG1 SOCKET
-
-/* Define to the type pointed by arg 2 for recvfrom. */
-#define RECVFROM_TYPE_ARG2 char
-
-/* Define to the type of arg 3 for recvfrom. */
-#define RECVFROM_TYPE_ARG3 int
-
-/* Define to the type of arg 4 for recvfrom. */
-#define RECVFROM_TYPE_ARG4 int
-
-/* Define to the type pointed by arg 5 for recvfrom. */
-#define RECVFROM_TYPE_ARG5 struct sockaddr
-
-/* Define to the type pointed by arg 6 for recvfrom. */
-#define RECVFROM_TYPE_ARG6 int
-
-/* Define to the function return type for recvfrom. */
-#define RECVFROM_TYPE_RETV int
-
 /* Define if you have the send function. */
 #define HAVE_SEND 1
 
@@ -346,9 +280,6 @@
 /* Define to the size of `int', as computed by sizeof. */
 #define SIZEOF_INT 4
 
-/* Define to the size of `long double', as computed by sizeof. */
-#define SIZEOF_LONG_DOUBLE 16
-
 /* Define to the size of `long long', as computed by sizeof. */
 /* #define SIZEOF_LONG_LONG 8 */
 
@@ -388,7 +319,6 @@
 #  undef SEND_TYPE_ARG3
 #  define HAVE_FREEADDRINFO
 #  define HAVE_GETADDRINFO
-#  define HAVE_GETHOSTBYNAME
 #  define HAVE_GETHOSTBYNAME_R
 #  define HAVE_GETHOSTBYNAME_R_6
 #  define LWIP_POSIX_SOCKETS_IO_NAMES 0
diff --git a/lib/config-win32ce.h b/lib/config-win32ce.h
index 90f9eeae2..ede63c94d 100644
--- a/lib/config-win32ce.h
+++ b/lib/config-win32ce.h
@@ -44,9 +44,6 @@
 /* Define if you have the <fcntl.h> header file.  */
 #define HAVE_FCNTL_H 1
 
-/* Define if you have the <getopt.h> header file.  */
-/* #define HAVE_GETOPT_H 1 */
-
 /* Define if you have the <io.h> header file.  */
 #define HAVE_IO_H 1
 
@@ -135,42 +132,21 @@
 /* Define if you have the closesocket function.  */
 #define HAVE_CLOSESOCKET 1
 
-/* Define if you don't have vprintf but do have _doprnt.  */
-/* #define HAVE_DOPRNT 1 */
-
 /* Define if you have the gethostname function.  */
 #define HAVE_GETHOSTNAME 1
 
-/* Define if you have the getpass function.  */
-/* #define HAVE_GETPASS 1 */
-
-/* Define if you have the getservbyname function.  */
-#define HAVE_GETSERVBYNAME 1
-
 /* Define if you have the gettimeofday function.  */
 /*  #define HAVE_GETTIMEOFDAY 1 */
 
-/* Define if you have the inet_addr function.  */
-#define HAVE_INET_ADDR 1
-
 /* Define if you have the ioctlsocket function. */
 #define HAVE_IOCTLSOCKET 1
 
 /* Define if you have a working ioctlsocket FIONBIO function. */
 #define HAVE_IOCTLSOCKET_FIONBIO 1
 
-/* Define if you have the RAND_screen function when using SSL  */
-#define HAVE_RAND_SCREEN 1
-
-/* Define if you have the `RAND_status' function when using SSL. */
-#define HAVE_RAND_STATUS 1
-
 /* Define if you have the select function.  */
 #define HAVE_SELECT 1
 
-/* Define if you have the setvbuf function.  */
-#define HAVE_SETVBUF 1
-
 /* Define if you have the socket function.  */
 #define HAVE_SOCKET 1
 
@@ -180,18 +156,9 @@
 /* Define if you have the strdup function.  */
 /* #define HAVE_STRDUP 1 */
 
-/* Define if you have the strftime function.  */
-/* #define HAVE_STRFTIME 1 */
-
 /* Define if you have the stricmp function. */
 /* #define HAVE_STRICMP 1 */
 
-/* Define if you have the strnicmp function. */
-/* #define HAVE_STRNICMP 1 */
-
-/* Define if you have the strstr function.  */
-#define HAVE_STRSTR 1
-
 /* Define if you have the strtoll function.  */
 #if defined(__MINGW32__)
 #define HAVE_STRTOLL 1
@@ -218,30 +185,6 @@
 /* Define to the function return type for recv. */
 #define RECV_TYPE_RETV int
 
-/* Define if you have the recvfrom function. */
-#define HAVE_RECVFROM 1
-
-/* Define to the type of arg 1 for recvfrom. */
-#define RECVFROM_TYPE_ARG1 SOCKET
-
-/* Define to the type pointed by arg 2 for recvfrom. */
-#define RECVFROM_TYPE_ARG2 char
-
-/* Define to the type of arg 3 for recvfrom. */
-#define RECVFROM_TYPE_ARG3 int
-
-/* Define to the type of arg 4 for recvfrom. */
-#define RECVFROM_TYPE_ARG4 int
-
-/* Define to the type pointed by arg 5 for recvfrom. */
-#define RECVFROM_TYPE_ARG5 struct sockaddr
-
-/* Define to the type pointed by arg 6 for recvfrom. */
-#define RECVFROM_TYPE_ARG6 int
-
-/* Define to the function return type for recvfrom. */
-#define RECVFROM_TYPE_RETV int
-
 /* Define if you have the send function. */
 #define HAVE_SEND 1
 
@@ -285,9 +228,6 @@
 /* The size of `int', as computed by sizeof. */
 #define SIZEOF_INT 4
 
-/* The size of `long double', as computed by sizeof. */
-#define SIZEOF_LONG_DOUBLE 16
-
 /* The size of `long long', as computed by sizeof. */
 /* #define SIZEOF_LONG_LONG 8 */
 
diff --git a/lib/curl_config.h.cmake b/lib/curl_config.h.cmake
index eb2c62b97..8cf1da600 100644
--- a/lib/curl_config.h.cmake
+++ b/lib/curl_config.h.cmake
@@ -147,9 +147,6 @@
 /* Define to 1 if you have the alarm function. */
 #cmakedefine HAVE_ALARM 1
 
-/* Define to 1 if you have the <alloca.h> header file. */
-#cmakedefine HAVE_ALLOCA_H 1
-
 /* Define to 1 if you have the <arpa/inet.h> header file. */
 #cmakedefine HAVE_ARPA_INET_H 1
 
@@ -177,12 +174,6 @@
 /* Define to 1 if you have the `closesocket' function. */
 #cmakedefine HAVE_CLOSESOCKET 1
 
-/* Define to 1 if you have the `CRYPTO_cleanup_all_ex_data' function. */
-#cmakedefine HAVE_CRYPTO_CLEANUP_ALL_EX_DATA 1
-
-/* Define to 1 if you have the <dlfcn.h> header file. */
-#cmakedefine HAVE_DLFCN_H 1
-
 /* Define to 1 if you have the <errno.h> header file. */
 #cmakedefine HAVE_ERRNO_H 1
 
@@ -210,9 +201,6 @@
 /* Define to 1 if you have the `getppid' function. */
 #cmakedefine HAVE_GETPPID 1
 
-/* Define to 1 if you have the gethostbyname function. */
-#cmakedefine HAVE_GETHOSTBYNAME 1
-
 /* Define to 1 if you have the gethostbyname_r function. */
 #cmakedefine HAVE_GETHOSTBYNAME_R 1
 
@@ -237,9 +225,6 @@
 /* Define to 1 if you have the `getppid' function. */
 #cmakedefine HAVE_GETPPID 1
 
-/* Define to 1 if you have the `getprotobyname' function. */
-#cmakedefine HAVE_GETPROTOBYNAME 1
-
 /* Define to 1 if you have the `getpeername' function. */
 #cmakedefine HAVE_GETPEERNAME 1
 
@@ -291,18 +276,9 @@
 /* Define to 1 if you have the `idna_strerror' function. */
 #cmakedefine HAVE_IDNA_STRERROR 1
 
-/* Define to 1 if you have the `idn_free' function. */
-#cmakedefine HAVE_IDN_FREE 1
-
-/* Define to 1 if you have the <idn-free.h> header file. */
-#cmakedefine HAVE_IDN_FREE_H 1
-
 /* Define to 1 if you have the <ifaddrs.h> header file. */
 #cmakedefine HAVE_IFADDRS_H 1
 
-/* Define to 1 if you have the `inet_addr' function. */
-#cmakedefine HAVE_INET_ADDR 1
-
 /* Define to 1 if you have a IPv6 capable working inet_ntop function. */
 #cmakedefine HAVE_INET_NTOP 1
 
@@ -318,9 +294,6 @@
 /* Define to 1 if you have the <inttypes.h> header file. */
 #cmakedefine HAVE_INTTYPES_H 1
 
-/* Define to 1 if you have the ioctl function. */
-#cmakedefine HAVE_IOCTL 1
-
 /* Define to 1 if you have the ioctlsocket function. */
 #cmakedefine HAVE_IOCTLSOCKET 1
 
@@ -343,21 +316,9 @@
 /* Define to 1 if you have the <io.h> header file. */
 #cmakedefine HAVE_IO_H 1
 
-/* if you have the Kerberos4 libraries (including -ldes) */
-#cmakedefine HAVE_KRB4 1
-
-/* Define to 1 if you have the `krb_get_our_ip_for_realm' function. */
-#cmakedefine HAVE_KRB_GET_OUR_IP_FOR_REALM 1
-
-/* Define to 1 if you have the <krb.h> header file. */
-#cmakedefine HAVE_KRB_H 1
-
 /* Define to 1 if you have the lber.h header file. */
 #cmakedefine HAVE_LBER_H 1
 
-/* Define to 1 if you have the ldapssl.h header file. */
-#cmakedefine HAVE_LDAPSSL_H 1
-
 /* Define to 1 if you have the ldap.h header file. */
 #cmakedefine HAVE_LDAP_H 1
 
@@ -379,12 +340,6 @@
 /* Define to 1 if you have the idn2.h header file. */
 #cmakedefine HAVE_IDN2_H 1
 
-/* Define to 1 if you have the `resolv' library (-lresolv). */
-#cmakedefine HAVE_LIBRESOLV 1
-
-/* Define to 1 if you have the `resolve' library (-lresolve). */
-#cmakedefine HAVE_LIBRESOLVE 1
-
 /* Define to 1 if you have the `socket' library (-lsocket). */
 #cmakedefine HAVE_LIBSOCKET 1
 
@@ -412,24 +367,12 @@
 /* if zstd is available */
 #cmakedefine HAVE_ZSTD 1
 
-/* if your compiler supports LL */
-#cmakedefine HAVE_LL 1
-
 /* Define to 1 if you have the <locale.h> header file. */
 #cmakedefine HAVE_LOCALE_H 1
 
-/* Define to 1 if you have a working localtime_r function. */
-#cmakedefine HAVE_LOCALTIME_R 1
-
 /* Define to 1 if the compiler supports the 'long long' data type. */
 #cmakedefine HAVE_LONGLONG 1
 
-/* Define to 1 if you have the malloc.h header file. */
-#cmakedefine HAVE_MALLOC_H 1
-
-/* Define to 1 if you have the <memory.h> header file. */
-#cmakedefine HAVE_MEMORY_H 1
-
 /* Define to 1 if you have the MSG_NOSIGNAL flag. */
 #cmakedefine HAVE_MSG_NOSIGNAL 1
 
@@ -448,42 +391,12 @@
 /* Define to 1 if you have the <net/if.h> header file. */
 #cmakedefine HAVE_NET_IF_H 1
 
-/* Define to 1 if NI_WITHSCOPEID exists and works. */
-#cmakedefine HAVE_NI_WITHSCOPEID 1
-
 /* if you have an old MIT gssapi library, lacking GSS_C_NT_HOSTBASED_SERVICE */
 #cmakedefine HAVE_OLD_GSSMIT 1
 
-/* Define to 1 if you have the <openssl/crypto.h> header file. */
-#cmakedefine HAVE_OPENSSL_CRYPTO_H 1
-
-/* Define to 1 if you have the <openssl/err.h> header file. */
-#cmakedefine HAVE_OPENSSL_ERR_H 1
-
-/* Define to 1 if you have the <openssl/pem.h> header file. */
-#cmakedefine HAVE_OPENSSL_PEM_H 1
-
-/* Define to 1 if you have the <openssl/pkcs12.h> header file. */
-#cmakedefine HAVE_OPENSSL_PKCS12_H 1
-
-/* Define to 1 if you have the <openssl/rsa.h> header file. */
-#cmakedefine HAVE_OPENSSL_RSA_H 1
-
-/* Define to 1 if you have the <openssl/ssl.h> header file. */
-#cmakedefine HAVE_OPENSSL_SSL_H 1
-
-/* Define to 1 if you have the <openssl/x509.h> header file. */
-#cmakedefine HAVE_OPENSSL_X509_H 1
-
-/* Define to 1 if you have the <pem.h> header file. */
-#cmakedefine HAVE_PEM_H 1
-
 /* Define to 1 if you have the `pipe' function. */
 #cmakedefine HAVE_PIPE 1
 
-/* Define to 1 if you have a working poll function. */
-#cmakedefine HAVE_POLL 1
-
 /* If you have a fine poll */
 #cmakedefine HAVE_POLL_FINE 1
 
@@ -502,18 +415,9 @@
 /* Define to 1 if you have the `RAND_egd' function. */
 #cmakedefine HAVE_RAND_EGD 1
 
-/* Define to 1 if you have the `RAND_screen' function. */
-#cmakedefine HAVE_RAND_SCREEN 1
-
-/* Define to 1 if you have the `RAND_status' function. */
-#cmakedefine HAVE_RAND_STATUS 1
-
 /* Define to 1 if you have the recv function. */
 #cmakedefine HAVE_RECV 1
 
-/* Define to 1 if you have the recvfrom function. */
-#cmakedefine HAVE_RECVFROM 1
-
 /* Define to 1 if you have the select function. */
 #cmakedefine HAVE_SELECT 1
 
@@ -541,9 +445,6 @@
 /* Define to 1 if you have the `setrlimit' function. */
 #cmakedefine HAVE_SETRLIMIT 1
 
-/* Define to 1 if you have the setsockopt function. */
-#cmakedefine HAVE_SETSOCKOPT 1
-
 /* Define to 1 if you have a working setsockopt SO_NONBLOCK function. */
 #cmakedefine HAVE_SETSOCKOPT_SO_NONBLOCK 1
 
@@ -577,18 +478,12 @@
 /* Define to 1 if you have the <stdint.h> header file. */
 #cmakedefine HAVE_STDINT_H 1
 
-/* Define to 1 if you have the <stdio.h> header file. */
-#cmakedefine HAVE_STDIO_H 1
-
 /* Define to 1 if you have the <stdlib.h> header file. */
 #cmakedefine HAVE_STDLIB_H 1
 
 /* Define to 1 if you have the strcasecmp function. */
 #cmakedefine HAVE_STRCASECMP 1
 
-/* Define to 1 if you have the strcasestr function. */
-#cmakedefine HAVE_STRCASESTR 1
-
 /* Define to 1 if you have the strcmpi function. */
 #cmakedefine HAVE_STRCMPI 1
 
@@ -607,18 +502,9 @@
 /* Define to 1 if you have the <string.h> header file. */
 #cmakedefine HAVE_STRING_H 1
 
-/* Define to 1 if you have the strncmpi function. */
-#cmakedefine HAVE_STRNCMPI 1
-
-/* Define to 1 if you have the strnicmp function. */
-#cmakedefine HAVE_STRNICMP 1
-
 /* Define to 1 if you have the <stropts.h> header file. */
 #cmakedefine HAVE_STROPTS_H 1
 
-/* Define to 1 if you have the strstr function. */
-#cmakedefine HAVE_STRSTR 1
-
 /* Define to 1 if you have the strtok_r function. */
 #cmakedefine HAVE_STRTOK_R 1
 
@@ -664,9 +550,6 @@
 /* Define to 1 if you have the <sys/types.h> header file. */
 #cmakedefine HAVE_SYS_TYPES_H 1
 
-/* Define to 1 if you have the <sys/uio.h> header file. */
-#cmakedefine HAVE_SYS_UIO_H 1
-
 /* Define to 1 if you have the <sys/un.h> header file. */
 #cmakedefine HAVE_SYS_UN_H 1
 
@@ -682,15 +565,6 @@
 /* Define to 1 if you have the <time.h> header file. */
 #cmakedefine HAVE_TIME_H 1
 
-/* Define to 1 if you have the <tld.h> header file. */
-#cmakedefine HAVE_TLD_H 1
-
-/* Define to 1 if you have the `tld_strerror' function. */
-#cmakedefine HAVE_TLD_STRERROR 1
-
-/* Define to 1 if you have the `uname' function. */
-#cmakedefine HAVE_UNAME 1
-
 /* Define to 1 if you have the <unistd.h> header file. */
 #cmakedefine HAVE_UNISTD_H 1
 
@@ -709,9 +583,6 @@
 /* Define to 1 if compiler supports old gcc variadic macro style. */
 #cmakedefine HAVE_VARIADIC_MACROS_GCC 1
 
-/* Define to 1 if you have the winber.h header file. */
-#cmakedefine HAVE_WINBER_H 1
-
 /* Define to 1 if you have the windows.h header file. */
 #cmakedefine HAVE_WINDOWS_H 1
 
@@ -724,28 +595,15 @@
 /* Define this symbol if your OS supports changing the contents of argv */
 #cmakedefine HAVE_WRITABLE_ARGV 1
 
-/* Define to 1 if you have the writev function. */
-#cmakedefine HAVE_WRITEV 1
-
 /* Define to 1 if you have the ws2tcpip.h header file. */
 #cmakedefine HAVE_WS2TCPIP_H 1
 
-/* Define to 1 if you have the <x509.h> header file. */
-#cmakedefine HAVE_X509_H 1
-
 /* Define if you have the <process.h> header file. */
 #cmakedefine HAVE_PROCESS_H 1
 
 /* if you have the zlib.h header file */
 #cmakedefine HAVE_ZLIB_H 1
 
-/* Define to the sub-directory in which libtool stores uninstalled libraries.
-   */
-#cmakedefine LT_OBJDIR ${LT_OBJDIR}
-
-/* If you lack a fine basename() prototype */
-#cmakedefine NEED_BASENAME_PROTO 1
-
 /* Define to 1 if you need the lber.h header file even with ldap.h */
 #cmakedefine NEED_LBER_H 1
 
@@ -779,36 +637,6 @@
 /* a suitable file to read random data from */
 #cmakedefine RANDOM_FILE "${RANDOM_FILE}"
 
-/* Define to the type of arg 1 for recvfrom. */
-#cmakedefine RECVFROM_TYPE_ARG1 ${RECVFROM_TYPE_ARG1}
-
-/* Define to the type pointed by arg 2 for recvfrom. */
-#cmakedefine RECVFROM_TYPE_ARG2 ${RECVFROM_TYPE_ARG2}
-
-/* Define to 1 if the type pointed by arg 2 for recvfrom is void. */
-#cmakedefine RECVFROM_TYPE_ARG2_IS_VOID 1
-
-/* Define to the type of arg 3 for recvfrom. */
-#cmakedefine RECVFROM_TYPE_ARG3 ${RECVFROM_TYPE_ARG3}
-
-/* Define to the type of arg 4 for recvfrom. */
-#cmakedefine RECVFROM_TYPE_ARG4 ${RECVFROM_TYPE_ARG4}
-
-/* Define to the type pointed by arg 5 for recvfrom. */
-#cmakedefine RECVFROM_TYPE_ARG5 ${RECVFROM_TYPE_ARG5}
-
-/* Define to 1 if the type pointed by arg 5 for recvfrom is void. */
-#cmakedefine RECVFROM_TYPE_ARG5_IS_VOID 1
-
-/* Define to the type pointed by arg 6 for recvfrom. */
-#cmakedefine RECVFROM_TYPE_ARG6 ${RECVFROM_TYPE_ARG6}
-
-/* Define to 1 if the type pointed by arg 6 for recvfrom is void. */
-#cmakedefine RECVFROM_TYPE_ARG6_IS_VOID 1
-
-/* Define to the function return type for recvfrom. */
-#cmakedefine RECVFROM_TYPE_RETV ${RECVFROM_TYPE_RETV}
-
 /* Define to the type of arg 1 for recv. */
 #cmakedefine RECV_TYPE_ARG1 ${RECV_TYPE_ARG1}
 
@@ -890,9 +718,6 @@ ${SIZEOF_TIME_T_CODE}
 /* Define to 1 if you have the ANSI C header files. */
 #cmakedefine STDC_HEADERS 1
 
-/* Define to the type of arg 3 for strerror_r. */
-#cmakedefine STRERROR_R_TYPE_ARG3 ${STRERROR_R_TYPE_ARG3}
-
 /* Define to 1 if you can safely include both <sys/time.h> and <time.h>. */
 #cmakedefine TIME_WITH_SYS_TIME 1
 
@@ -981,9 +806,6 @@ ${SIZEOF_TIME_T_CODE}
 /* enable multiple SSL backends */
 #cmakedefine CURL_WITH_MULTI_SSL 1
 
-/* Define to 1 if using yaSSL in OpenSSL compatibility mode. */
-#cmakedefine USE_YASSLEMUL 1
-
 /* Version number of package */
 #cmakedefine VERSION ${VERSION}
 
diff --git a/lib/curl_setup.h b/lib/curl_setup.h
index 4bc8aea38..4286dcfa9 100644
--- a/lib/curl_setup.h
+++ b/lib/curl_setup.h
@@ -563,7 +563,6 @@
 /* now undef the stock libc functions just to avoid them being used */
 #  undef HAVE_GETADDRINFO
 #  undef HAVE_FREEADDRINFO
-#  undef HAVE_GETHOSTBYNAME
 #elif defined(USE_THREADS_POSIX) || defined(USE_THREADS_WIN32)
 #  define CURLRES_ASYNCH
 #  define CURLRES_THREADED
diff --git a/lib/curl_setup_once.h b/lib/curl_setup_once.h
index 656dc0837..e9730c928 100644
--- a/lib/curl_setup_once.h
+++ b/lib/curl_setup_once.h
@@ -204,46 +204,6 @@ struct timeval {
 #endif /* HAVE_SEND */
 
 
-#if 0
-#if defined(HAVE_RECVFROM)
-/*
- * Currently recvfrom is only used on udp sockets.
- */
-#if !defined(RECVFROM_TYPE_ARG1) || \
-    !defined(RECVFROM_TYPE_ARG2) || \
-    !defined(RECVFROM_TYPE_ARG3) || \
-    !defined(RECVFROM_TYPE_ARG4) || \
-    !defined(RECVFROM_TYPE_ARG5) || \
-    !defined(RECVFROM_TYPE_ARG6) || \
-    !defined(RECVFROM_TYPE_RETV)
-  /* */
-  Error Missing_definition_of_return_and_arguments_types_of_recvfrom
-  /* */
-#else
-#define sreadfrom(s,b,bl,f,fl) (ssize_t)recvfrom((RECVFROM_TYPE_ARG1)  (s),  \
-                                                 (RECVFROM_TYPE_ARG2 *)(b),  \
-                                                 (RECVFROM_TYPE_ARG3)  (bl), \
-                                                 (RECVFROM_TYPE_ARG4)  (0),  \
-                                                 (RECVFROM_TYPE_ARG5 *)(f),  \
-                                                 (RECVFROM_TYPE_ARG6 *)(fl))
-#endif
-#else /* HAVE_RECVFROM */
-#ifndef sreadfrom
-  /* */
-  Error Missing_definition_of_macro_sreadfrom
-  /* */
-#endif
-#endif /* HAVE_RECVFROM */
-
-
-#ifdef RECVFROM_TYPE_ARG6_IS_VOID
-#  define RECVFROM_ARG6_T int
-#else
-#  define RECVFROM_ARG6_T RECVFROM_TYPE_ARG6
-#endif
-#endif /* if 0 */
-
-
 /*
  * Function-like macro definition used to close a socket.
  */