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-rw-r--r--lang/perl5/Makefile4
1 files changed, 4 insertions, 0 deletions
diff --git a/lang/perl5/Makefile b/lang/perl5/Makefile
index 943341d19ed3..d88341c43852 100644
--- a/lang/perl5/Makefile
+++ b/lang/perl5/Makefile
@@ -50,6 +50,10 @@ CONFIGURE_ARGS+= -Dusemymalloc=n
INCLUDEDIR= /usr/include
+.ifdef USE_PERL5
+.error You have `USE_PERL5' variable defined either in environment or in make(1) arguments. Please undefine and try again.
+.endif
+
.include <bsd.port.pre.mk>
MAN1= a2p.1 c2ph.1 dprofpp.1 find2perl.1 h2ph.1 h2xs.1 perl.1 \