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-rw-r--r--devel/gmake381/Makefile4
1 files changed, 4 insertions, 0 deletions
diff --git a/devel/gmake381/Makefile b/devel/gmake381/Makefile
index 5c90eb5e6ab1..ce8d5b070e51 100644
--- a/devel/gmake381/Makefile
+++ b/devel/gmake381/Makefile
@@ -23,6 +23,10 @@ CONFIGURE_ENV= CPPFLAGS="-I${LOCALBASE}/include -DHAVE_LOCALE_H -DHAVE_LC_MESSAG
MAN1= gmake.1
+.ifdef USE_GMAKE
+.error You have `USE_GMAKE' variable defined either in environment or in make(1) arguments. Please undefine and try again.
+.endif
+
# joerg@freebsd.org says our getloadavg() no longer requires setgid kmem
post-install: