--- old/libguile/gc.h	2016-08-05 14:52:22 +0200
+++ new/libguile/gc.h	2016-08-05 14:51:51 +0200
@@ -273,6 +273,8 @@
 #ifdef __GNUC__
   __asm__ volatile ("" : : : "memory");
 #else
+SCM_API void scm_remember_upto_here_1 (SCM obj);
+
   /* portable version, just in case any other compiler does the same
      thing.  */
   scm_remember_upto_here_1 (z);