diff --git a/development/s51dude/s51dude.SlackBuild b/development/s51dude/s51dude.SlackBuild
index 80a8dcd05a..2b3e6ede52 100644
--- a/development/s51dude/s51dude.SlackBuild
+++ b/development/s51dude/s51dude.SlackBuild
@@ -69,7 +69,7 @@ find -L . \
  \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
 
-make
+make CFLAGS="-fgnu89-inline $SLKCFLAGS"
 mkdir -p $PKG/usr/bin $PKG/usr/man/man1
 
 install -m755 s51dude $PKG/usr/bin