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-rw-r--r--configure.ac6
1 files changed, 6 insertions, 0 deletions
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=],