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-rw-r--r--devel/bison20/Makefile4
1 files changed, 4 insertions, 0 deletions
diff --git a/devel/bison20/Makefile b/devel/bison20/Makefile
index f9c118f..ed700d3 100644
--- a/devel/bison20/Makefile
+++ b/devel/bison20/Makefile
@@ -27,6 +27,10 @@ CONFIGURE_TARGET= --target=${MACHINE_ARCH}-unknown-freebsd${OSREL}
MAN1= bison.1
+.ifdef USE_BISON
+.error You have `USE_BISON' variable defined either in environment or in make(1) arguments. Please undefine and try again.
+.endif
+
post-extract:
@${RM} -f ${WRKSRC}/doc/bison.info*
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