File gnuplot-config.patch of Package gnuplot

diff --git a/configure b/configure
index f1046e4..e0c4f76 100755
--- a/configure
+++ b/configure
@@ -2092,7 +2092,7 @@ else
 #ifdef __cplusplus
 extern "C"
 #endif
-char $2 ();
+__attribute__ ((used)) char $2 ();
 /* The GNU C library defines this for functions which it implements
     to always fail with ENOSYS.  Some functions are actually named
     something starting with __ and the normal name is an alias.  */