diff -Nur original/clients/olvwm-4.1/Imakefile modified/clients/olvwm-4.1/Imakefile
--- original/clients/olvwm-4.1/Imakefile	2018-05-27 10:38:39.597085999 +0100
+++ modified/clients/olvwm-4.1/Imakefile	2018-05-27 15:07:46.342667666 +0100
@@ -78,6 +78,8 @@
 
 #include <XView.tmpl>
 
+CC=gcc-5
+
 XCOMM # Link libolgx static
 OLGXLIB = -Wl,-Bstatic -lolgx -Wl,-Bdynamic
 
diff -Nur original/config/XView.tmpl modified/config/XView.tmpl
--- original/config/XView.tmpl	2018-05-27 10:38:39.620419333 +0100
+++ modified/config/XView.tmpl	2018-05-27 15:06:50.799334333 +0100
@@ -459,10 +459,10 @@
 
 /*  This is just needed here because X11 is installed with gcc as
     a default compiler.
-	lumpi@dobag.in-berlin.de
+	lumpi@dobag.in-berlin.de */
 
 #undef CcCmd
-#define CcCmd cc
-#define LibraryCcCmd cc */
+#define CcCmd gcc-5
+#define LibraryCcCmd gcc-5
 #include <XView.rules>
 #endif /* XViewTmpl */