1 files changed, 18 insertions, 8 deletions

diff --git a/configure.in b/configure.in
index ee928d44..5153b1c2 100644
--- a/configure.in
+++ b/configure.in
@@ -275,9 +275,15 @@ else
   AC_SUBST(MYSQLCFLAGS)
 fi
 
+AC_ARG_WITH([ipv6],
+        [AS_HELP_STRING([--with-ipv6], [support IPv6 @<:@default=check@:>@])],
+        [], [with_ipv6=check])
+
 dnl Check for AF_INET6 support - unistd.h required for Darwin
-AC_CACHE_CHECK([for IPv6 support], with_ipv6, [
-        AC_TRY_COMPILE([#ifdef HAVE_UNISTD_H
+if test "$with_ipv6" != "no"; then
+        AC_CACHE_CHECK([for IPv6 support], np_cv_sys_ipv6, [
+                AC_TRY_COMPILE(
+                        [#ifdef HAVE_UNISTD_H
                         #include <unistd.h>
                         #endif
                         #include <netinet/in.h>
@@ -288,12 +294,16 @@ AC_CACHE_CHECK([for IPv6 support], with_ipv6, [
                         sin6.sin6_family = AF_INET6;
                         sin6.sin6_port = 587;
                         p = &sin6.sin6_addr;],
-                        [with_ipv6=yes], 
-                        [with_ipv6=no])
-        ])
-
-if test x"$with_ipv6" != xno ; then
-        AC_DEFINE(USE_IPV6,1,[Enable IPv6 support])
+                        [np_cv_sys_ipv6=yes],
+                        [np_cv_sys_ipv6=no])
+                ])
+        if test "$np_cv_sys_ipv6" = "no" -a "$with_ipv6" != "check"; then
+                AC_MSG_FAILURE([--with-ipv6 was given, but test for IPv6 support failed])
+        fi
+        if test "$np_cv_sys_ipv6" = "yes"; then
+                AC_DEFINE(USE_IPV6,1,[Enable IPv6 support])
+        fi
+        with_ipv6="$np_cv_sys_ipv6"
 fi