1 files changed, 2 insertions, 4 deletions
diff --git a/nixpkgs/pkgs/applications/version-management/monotone-viz/graphviz-2.0.nix b/nixpkgs/pkgs/applications/version-management/monotone-viz/graphviz-2.0.nix
index 8ecc5bf9ac8f..541a2262f999 100644
--- a/nixpkgs/pkgs/applications/version-management/monotone-viz/graphviz-2.0.nix
+++ b/nixpkgs/pkgs/applications/version-management/monotone-viz/graphviz-2.0.nix
@@ -1,9 +1,7 @@
 { lib, stdenv, fetchurl, pkg-config, xlibsWrapper, libpng, libjpeg, expat, libXaw
-, yacc, libtool, fontconfig, pango, gd, libwebp
+, bison, libtool, fontconfig, pango, gd, libwebp
 }:
 
-assert libpng != null && libjpeg != null && expat != null;
-
 stdenv.mkDerivation rec {
   name = "graphviz-2.0";
 
@@ -14,7 +12,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ pkg-config ];
   buildInputs = [
-    xlibsWrapper libpng libjpeg expat libXaw yacc
+    xlibsWrapper libpng libjpeg expat libXaw bison
     libtool fontconfig pango gd libwebp
   ];