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); }
 ]], [[ ]]