https://bugs.gentoo.org/900326

--- a/configure.ac
+++ b/configure.ac
@@ -87,6 +87,7 @@ AC_CHECK_FUNCS(_snprintf snprintf)
 	
 AC_MSG_CHECKING(for unaligned long accesses)
 AC_TRY_RUN([
+	#include <stdlib.h>
 	void main(void)
 	{	unsigned char data[sizeof(long)*2];
 		long *ptr;