diff --git a/src/s/sunos4-1.h b/src/s/sunos4-1.h
index 241024249a8..2104e87cf6a 100644
--- a/src/s/sunos4-1.h
+++ b/src/s/sunos4-1.h
@@ -39,3 +39,13 @@
 /* Tell GNU malloc to compensate for a bug in localtime.  */
 #define SUNOS_LOCALTIME_BUG
 #endif
+
+/* This is for compilation with acc.  It works with -Xt but not with -Xs.
+   Note you will need to specify a -L option so that -lansi gets found.
+   The precise -L option you need depends on the compiler version
+   so we cannot specify it here.  */
+#ifndef __GNUC__
+#ifdef __STDC__
+#define LIB_STANDARD -u _fix_libc_ -lansi -lc
+#endif
+#endif