From daeaf63f9c2db4a73a6c41be9b72930f9965a5aa Mon Sep 17 00:00:00 2001
From: Frank Denis <github@pureftpd.org>
Date: Wed, 13 Apr 2016 09:22:51 +0200
Subject: [PATCH] Not an ELF system, not an Apple system, weak symbols may not
 work

---
 configure.ac | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/configure.ac b/configure.ac
index 9c6ab047..fec392f8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -600,6 +600,9 @@ __asm__ __volatile__ (".hidden dummy_symbol \n"
 
 AC_MSG_CHECKING(if weak symbols are supported)
 AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#if !defined(__ELF__) && !defined(__APPLE_CC__)
+# error Support for weak symbols may not be available
+#endif
 __attribute__((weak)) void __dummy(void *x) { }
 void f(void *x) { __dummy(x); }
 ]], [[ ]]