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-rw-r--r--cad/iverilog/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/cad/iverilog/Makefile b/cad/iverilog/Makefile
index a85697016343..12a0d4793aca 100644
--- a/cad/iverilog/Makefile
+++ b/cad/iverilog/Makefile
@@ -16,6 +16,7 @@ MAINTAINER= ijliao@FreeBSD.org
GNU_CONFIGURE= yes
+USE_BISON= yes
USE_GMAKE= yes
MAN1= iverilog.1