diff --git a/academic/antiprism/antiprism.SlackBuild b/academic/antiprism/antiprism.SlackBuild
index 271184a166..f3c6c291e6 100644
--- a/academic/antiprism/antiprism.SlackBuild
+++ b/academic/antiprism/antiprism.SlackBuild
@@ -55,7 +55,7 @@ find -L . \
 sed "/^docdir/s|= .*|= @docdir@|" -i Makefile.in
 
 CFLAGS="$SLKCFLAGS" \
-CXXFLAGS="$SLKCFLAGS" \
+CXXFLAGS="$SLKCFLAGS -fpermissive" \
 ./configure \
   --prefix=/usr \
   --libdir=/usr/lib$LIBDIRSUFFIX \