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-rw-r--r--Makefile2
-rw-r--r--config.mak.in1
-rw-r--r--configure.ac6
3 files changed, 9 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index a566bd9aed..13aa24f918 100644
--- a/Makefile
+++ b/Makefile
@@ -38,6 +38,8 @@ all::
#
# Define NO_SETENV if you don't have setenv in the C library.
#
+# Define NO_UNSETENV if you don't have unsetenv in the C library.
+#
# Define NO_MKDTEMP if you don't have mkdtemp in the C library.
#
# Define NO_SYMLINK_HEAD if you never want .git/HEAD to be a symbolic link.
diff --git a/config.mak.in b/config.mak.in
index 15fb26cb92..40b14d985a 100644
--- a/config.mak.in
+++ b/config.mak.in
@@ -40,6 +40,7 @@ NO_MEMMEM=@NO_MEMMEM@
NO_STRLCPY=@NO_STRLCPY@
NO_STRTOUMAX=@NO_STRTOUMAX@
NO_SETENV=@NO_SETENV@
+NO_UNSETENV=@NO_UNSETENV@
NO_MKDTEMP=@NO_MKDTEMP@
NO_ICONV=@NO_ICONV@
OLD_ICONV=@OLD_ICONV@
diff --git a/configure.ac b/configure.ac
index 6f641e32f0..af177fdb4d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -356,6 +356,12 @@ AC_CHECK_FUNC(setenv,
[NO_SETENV=YesPlease])
AC_SUBST(NO_SETENV)
#
+# Define NO_UNSETENV if you don't have unsetenv in the C library.
+AC_CHECK_FUNC(unsetenv,
+[NO_UNSETENV=],
+[NO_UNSETENV=YesPlease])
+AC_SUBST(NO_UNSETENV)
+#
# Define NO_MKDTEMP if you don't have mkdtemp in the C library.
AC_CHECK_FUNC(mkdtemp,
[NO_MKDTEMP=],