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diff --git a/include/curl/system.h b/include/curl/system.h
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--- /dev/null
+++ b/include/curl/system.h
@@ -0,0 +1,457 @@
+#ifndef __CURL_SYSTEM_H
+#define __CURL_SYSTEM_H
+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+/*
+ * This header is supposed to eventually replace curlbuild.h. This little one
+ * is still learning. During the experimental phase, this header files
+ * defines symbols using the prefixes CURLSYS_ or curlsys_. When we feel
+ * confident enough, we replace curlbuild.h with this file and rename all
+ * prefixes to CURL_ and curl_.
+ */
+
+/*
+ * Try to keep one section per platform, compiler and architecture, otherwise,
+ * if an existing section is reused for a different one and later on the
+ * original is adjusted, probably the piggybacking one can be adversely
+ * changed.
+ *
+ * In order to differentiate between platforms/compilers/architectures use
+ * only compiler built in predefined preprocessor symbols.
+ *
+ * curl_off_t
+ * ----------
+ *
+ * For any given platform/compiler curl_off_t must be typedef'ed to a 64-bit
+ * wide signed integral data type. The width of this data type must remain
+ * constant and independent of any possible large file support settings.
+ *
+ * As an exception to the above, curl_off_t shall be typedef'ed to a 32-bit
+ * wide signed integral data type if there is no 64-bit type.
+ *
+ * As a general rule, curl_off_t shall not be mapped to off_t. This rule shall
+ * only be violated if off_t is the only 64-bit data type available and the
+ * size of off_t is independent of large file support settings. Keep your
+ * build on the safe side avoiding an off_t gating. If you have a 64-bit
+ * off_t then take for sure that another 64-bit data type exists, dig deeper
+ * and you will find it.
+ *
+ */
+
+#if defined(__DJGPP__) || defined(__GO32__)
+# if defined(__DJGPP__) && (__DJGPP__ > 1)
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T long long
+# define CURLSYS_FORMAT_CURL_OFF_T "lld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "llu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T LL
+# define CURLSYS_SUFFIX_CURL_OFF_TU ULL
+# else
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T long
+# define CURLSYS_FORMAT_CURL_OFF_T "ld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "lu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 4
+# define CURLSYS_SUFFIX_CURL_OFF_T L
+# define CURLSYS_SUFFIX_CURL_OFF_TU UL
+# endif
+# define CURLSYS_TYPEOF_CURL_SOCKLEN_T int
+# define CURLSYS_SIZEOF_CURL_SOCKLEN_T 4
+
+#elif defined(__SALFORDC__)
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T long
+# define CURLSYS_FORMAT_CURL_OFF_T "ld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "lu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 4
+# define CURLSYS_SUFFIX_CURL_OFF_T L
+# define CURLSYS_SUFFIX_CURL_OFF_TU UL
+# define CURLSYS_TYPEOF_CURL_SOCKLEN_T int
+# define CURLSYS_SIZEOF_CURL_SOCKLEN_T 4
+
+#elif defined(__BORLANDC__)
+# if (__BORLANDC__ < 0x520)
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T long
+# define CURLSYS_FORMAT_CURL_OFF_T "ld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "lu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 4
+# define CURLSYS_SUFFIX_CURL_OFF_T L
+# define CURLSYS_SUFFIX_CURL_OFF_TU UL
+# else
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T __int64
+# define CURLSYS_FORMAT_CURL_OFF_T "I64d"
+# define CURLSYS_FORMAT_CURL_OFF_TU "I64u"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T i64
+# define CURLSYS_SUFFIX_CURL_OFF_TU ui64
+# endif
+# define CURLSYS_TYPEOF_CURL_SOCKLEN_T int
+# define CURLSYS_SIZEOF_CURL_SOCKLEN_T 4
+
+#elif defined(__TURBOC__)
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T long
+# define CURLSYS_FORMAT_CURL_OFF_T "ld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "lu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 4
+# define CURLSYS_SUFFIX_CURL_OFF_T L
+# define CURLSYS_SUFFIX_CURL_OFF_TU UL
+# define CURLSYS_TYPEOF_CURL_SOCKLEN_T int
+# define CURLSYS_SIZEOF_CURL_SOCKLEN_T 4
+
+#elif defined(__WATCOMC__)
+# if defined(__386__)
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T __int64
+# define CURLSYS_FORMAT_CURL_OFF_T "I64d"
+# define CURLSYS_FORMAT_CURL_OFF_TU "I64u"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T i64
+# define CURLSYS_SUFFIX_CURL_OFF_TU ui64
+# else
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T long
+# define CURLSYS_FORMAT_CURL_OFF_T "ld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "lu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 4
+# define CURLSYS_SUFFIX_CURL_OFF_T L
+# define CURLSYS_SUFFIX_CURL_OFF_TU UL
+# endif
+# define CURLSYS_TYPEOF_CURL_SOCKLEN_T int
+# define CURLSYS_SIZEOF_CURL_SOCKLEN_T 4
+
+#elif defined(__POCC__)
+# if (__POCC__ < 280)
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T long
+# define CURLSYS_FORMAT_CURL_OFF_T "ld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "lu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 4
+# define CURLSYS_SUFFIX_CURL_OFF_T L
+# define CURLSYS_SUFFIX_CURL_OFF_TU UL
+# elif defined(_MSC_VER)
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T __int64
+# define CURLSYS_FORMAT_CURL_OFF_T "I64d"
+# define CURLSYS_FORMAT_CURL_OFF_TU "I64u"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T i64
+# define CURLSYS_SUFFIX_CURL_OFF_TU ui64
+# else
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T long long
+# define CURLSYS_FORMAT_CURL_OFF_T "lld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "llu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T LL
+# define CURLSYS_SUFFIX_CURL_OFF_TU ULL
+# endif
+# define CURLSYS_TYPEOF_CURL_SOCKLEN_T int
+# define CURLSYS_SIZEOF_CURL_SOCKLEN_T 4
+
+#elif defined(__LCC__)
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T long
+# define CURLSYS_FORMAT_CURL_OFF_T "ld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "lu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 4
+# define CURLSYS_SUFFIX_CURL_OFF_T L
+# define CURLSYS_SUFFIX_CURL_OFF_TU UL
+# define CURLSYS_TYPEOF_CURL_SOCKLEN_T int
+# define CURLSYS_SIZEOF_CURL_SOCKLEN_T 4
+
+#elif defined(__SYMBIAN32__)
+# if defined(__EABI__) /* Treat all ARM compilers equally */
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T long long
+# define CURLSYS_FORMAT_CURL_OFF_T "lld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "llu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T LL
+# define CURLSYS_SUFFIX_CURL_OFF_TU ULL
+# elif defined(__CW32__)
+# pragma longlong on
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T long long
+# define CURLSYS_FORMAT_CURL_OFF_T "lld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "llu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T LL
+# define CURLSYS_SUFFIX_CURL_OFF_TU ULL
+# elif defined(__VC32__)
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T __int64
+# define CURLSYS_FORMAT_CURL_OFF_T "lld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "llu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T LL
+# define CURLSYS_SUFFIX_CURL_OFF_TU ULL
+# endif
+# define CURLSYS_TYPEOF_CURL_SOCKLEN_T unsigned int
+# define CURLSYS_SIZEOF_CURL_SOCKLEN_T 4
+
+#elif defined(__MWERKS__)
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T long long
+# define CURLSYS_FORMAT_CURL_OFF_T "lld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "llu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T LL
+# define CURLSYS_SUFFIX_CURL_OFF_TU ULL
+# define CURLSYS_TYPEOF_CURL_SOCKLEN_T int
+# define CURLSYS_SIZEOF_CURL_SOCKLEN_T 4
+
+#elif defined(_WIN32_WCE)
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T __int64
+# define CURLSYS_FORMAT_CURL_OFF_T "I64d"
+# define CURLSYS_FORMAT_CURL_OFF_TU "I64u"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T i64
+# define CURLSYS_SUFFIX_CURL_OFF_TU ui64
+# define CURLSYS_TYPEOF_CURL_SOCKLEN_T int
+# define CURLSYS_SIZEOF_CURL_SOCKLEN_T 4
+
+#elif defined(__MINGW32__)
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T long long
+# define CURLSYS_FORMAT_CURL_OFF_T "I64d"
+# define CURLSYS_FORMAT_CURL_OFF_TU "I64u"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T LL
+# define CURLSYS_SUFFIX_CURL_OFF_TU ULL
+# define CURLSYS_TYPEOF_CURL_SOCKLEN_T int
+# define CURLSYS_SIZEOF_CURL_SOCKLEN_T 4
+
+#elif defined(__VMS)
+# if defined(__VAX)
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T long
+# define CURLSYS_FORMAT_CURL_OFF_T "ld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "lu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 4
+# define CURLSYS_SUFFIX_CURL_OFF_T L
+# define CURLSYS_SUFFIX_CURL_OFF_TU UL
+# else
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T long long
+# define CURLSYS_FORMAT_CURL_OFF_T "lld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "llu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T LL
+# define CURLSYS_SUFFIX_CURL_OFF_TU ULL
+# endif
+# define CURLSYS_TYPEOF_CURL_SOCKLEN_T unsigned int
+# define CURLSYS_SIZEOF_CURL_SOCKLEN_T 4
+
+#elif defined(__OS400__)
+# if defined(__ILEC400__)
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T long long
+# define CURLSYS_FORMAT_CURL_OFF_T "lld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "llu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T LL
+# define CURLSYS_SUFFIX_CURL_OFF_TU ULL
+# define CURLSYS_TYPEOF_CURL_SOCKLEN_T socklen_t
+# define CURLSYS_SIZEOF_CURL_SOCKLEN_T 4
+# define CURLSYS_PULL_SYS_TYPES_H 1
+# define CURLSYS_PULL_SYS_SOCKET_H 1
+# endif
+
+#elif defined(__MVS__)
+# if defined(__IBMC__) || defined(__IBMCPP__)
+# if defined(_ILP32)
+# define CURLSYS_SIZEOF_LONG 4
+# elif defined(_LP64)
+# define CURLSYS_SIZEOF_LONG 8
+# endif
+# if defined(_LONG_LONG)
+# define CURLSYS_TYPEOF_CURL_OFF_T long long
+# define CURLSYS_FORMAT_CURL_OFF_T "lld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "llu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T LL
+# define CURLSYS_SUFFIX_CURL_OFF_TU ULL
+# elif defined(_LP64)
+# define CURLSYS_TYPEOF_CURL_OFF_T long
+# define CURLSYS_FORMAT_CURL_OFF_T "ld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "lu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T L
+# define CURLSYS_SUFFIX_CURL_OFF_TU UL
+# else
+# define CURLSYS_TYPEOF_CURL_OFF_T long
+# define CURLSYS_FORMAT_CURL_OFF_T "ld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "lu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 4
+# define CURLSYS_SUFFIX_CURL_OFF_T L
+# define CURLSYS_SUFFIX_CURL_OFF_TU UL
+# endif
+# define CURLSYS_TYPEOF_CURL_SOCKLEN_T socklen_t
+# define CURLSYS_SIZEOF_CURL_SOCKLEN_T 4
+# define CURLSYS_PULL_SYS_TYPES_H 1
+# define CURLSYS_PULL_SYS_SOCKET_H 1
+# endif
+
+#elif defined(__370__)
+# if defined(__IBMC__) || defined(__IBMCPP__)
+# if defined(_ILP32)
+# define CURLSYS_SIZEOF_LONG 4
+# elif defined(_LP64)
+# define CURLSYS_SIZEOF_LONG 8
+# endif
+# if defined(_LONG_LONG)
+# define CURLSYS_TYPEOF_CURL_OFF_T long long
+# define CURLSYS_FORMAT_CURL_OFF_T "lld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "llu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T LL
+# define CURLSYS_SUFFIX_CURL_OFF_TU ULL
+# elif defined(_LP64)
+# define CURLSYS_TYPEOF_CURL_OFF_T long
+# define CURLSYS_FORMAT_CURL_OFF_T "ld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "lu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T L
+# define CURLSYS_SUFFIX_CURL_OFF_TU UL
+# else
+# define CURLSYS_TYPEOF_CURL_OFF_T long
+# define CURLSYS_FORMAT_CURL_OFF_T "ld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "lu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 4
+# define CURLSYS_SUFFIX_CURL_OFF_T L
+# define CURLSYS_SUFFIX_CURL_OFF_TU UL
+# endif
+# define CURLSYS_TYPEOF_CURL_SOCKLEN_T socklen_t
+# define CURLSYS_SIZEOF_CURL_SOCKLEN_T 4
+# define CURLSYS_PULL_SYS_TYPES_H 1
+# define CURLSYS_PULL_SYS_SOCKET_H 1
+# endif
+
+#elif defined(TPF)
+# define CURLSYS_SIZEOF_LONG 8
+# define CURLSYS_TYPEOF_CURL_OFF_T long
+# define CURLSYS_FORMAT_CURL_OFF_T "ld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "lu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T L
+# define CURLSYS_SUFFIX_CURL_OFF_TU UL
+# define CURLSYS_TYPEOF_CURL_SOCKLEN_T int
+# define CURLSYS_SIZEOF_CURL_SOCKLEN_T 4
+
+/* ===================================== */
+/* KEEP MSVC THE PENULTIMATE ENTRY */
+/* ===================================== */
+
+#elif defined(_MSC_VER)
+# if (_MSC_VER >= 900) && (_INTEGRAL_MAX_BITS >= 64)
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T __int64
+# define CURLSYS_FORMAT_CURL_OFF_T "I64d"
+# define CURLSYS_FORMAT_CURL_OFF_TU "I64u"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T i64
+# define CURLSYS_SUFFIX_CURL_OFF_TU ui64
+# else
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T long
+# define CURLSYS_FORMAT_CURL_OFF_T "ld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "lu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 4
+# define CURLSYS_SUFFIX_CURL_OFF_T L
+# define CURLSYS_SUFFIX_CURL_OFF_TU UL
+# endif
+# define CURLSYS_TYPEOF_CURL_SOCKLEN_T int
+# define CURLSYS_SIZEOF_CURL_SOCKLEN_T 4
+
+/* ===================================== */
+/* KEEP GENERIC GCC THE LAST ENTRY */
+/* ===================================== */
+
+#elif defined(__GNUC__)
+# if !defined(__LP64__) && (defined(__ILP32__) || \
+ defined(__i386__) || defined(__ppc__) || defined(__arm__) || \
+ defined(__sparc__) || defined(__mips__) || defined(__sh__))
+# define CURLSYS_SIZEOF_LONG 4
+# define CURLSYS_TYPEOF_CURL_OFF_T long long
+# define CURLSYS_FORMAT_CURL_OFF_T "lld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "llu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T LL
+# define CURLSYS_SUFFIX_CURL_OFF_TU ULL
+# elif defined(__LP64__) || \
+ defined(__x86_64__) || defined(__ppc64__) || defined(__sparc64__)
+# define CURLSYS_SIZEOF_LONG 8
+# define CURLSYS_TYPEOF_CURL_OFF_T long
+# define CURLSYS_FORMAT_CURL_OFF_T "ld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "lu"
+# define CURLSYS_SIZEOF_CURL_OFF_T 8
+# define CURLSYS_SUFFIX_CURL_OFF_T L
+# define CURLSYS_SUFFIX_CURL_OFF_TU UL
+# endif
+# define CURLSYS_TYPEOF_CURL_SOCKLEN_T socklen_t
+# define CURLSYS_SIZEOF_CURL_SOCKLEN_T 4
+# define CURLSYS_PULL_SYS_TYPES_H 1
+# define CURLSYS_PULL_SYS_SOCKET_H 1
+
+#else
+/* generic "safe guess" on old 32 bit style */
+# define CURLSYS_SIZEOF_CURL_SOCKLEN_T 4
+# define CURLSYS_SIZEOF_CURL_OFF_T 4
+# define CURLSYS_TYPEOF_CURL_OFF_T long
+# define CURLSYS_FORMAT_CURL_OFF_T "ld"
+# define CURLSYS_FORMAT_CURL_OFF_TU "lu"
+# define CURLSYS_SUFFIX_CURL_OFF_T L
+# define CURLSYS_SUFFIX_CURL_OFF_TU UL
+# define CURLSYS_TYPEOF_CURL_SOCKLEN_T int
+#endif
+
+/* CURLSYS_PULL_SYS_TYPES_H is defined above when inclusion of header file */
+/* sys/types.h is required here to properly make type definitions below. */
+#ifdef CURLSYS_PULL_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+
+/* CURLSYS_PULL_SYS_SOCKET_H is defined above when inclusion of header file */
+/* sys/socket.h is required here to properly make type definitions below. */
+#ifdef CURLSYS_PULL_SYS_SOCKET_H
+# include <sys/socket.h>
+#endif
+
+/* Data type definition of curl_socklen_t. */
+#ifdef CURLSYS_TYPEOF_CURL_SOCKLEN_T
+ typedef CURLSYS_TYPEOF_CURL_SOCKLEN_T curlsys_socklen_t;
+#endif
+
+/* Data type definition of curl_off_t. */
+
+#ifdef CURLSYS_TYPEOF_CURL_OFF_T
+ typedef CURLSYS_TYPEOF_CURL_OFF_T curlsys_off_t;
+#endif
+
+#endif /* __CURL_SYSTEM_H */
+