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-rw-r--r--pkgs/development/tools/parsing/bison/3.x.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/development/tools/parsing/bison/3.x.nix b/pkgs/development/tools/parsing/bison/3.x.nix
index e3bd4ac7a5a9..2e3a4f8d497b 100644
--- a/pkgs/development/tools/parsing/bison/3.x.nix
+++ b/pkgs/development/tools/parsing/bison/3.x.nix
@@ -8,10 +8,10 @@ stdenv.mkDerivation rec {
     sha256 = "1vc17y6242jlwp0gdj7wsim3nvc1ws7q3j0v3065nz8g9hd9vwnd";
   };
 
-  nativeBuildInputs = [ m4 ] ++ stdenv.lib.optionals doCheck [perl flex];
+  nativeBuildInputs = [ m4 perl ] ++ stdenv.lib.optionals doCheck [ flex ];
   propagatedBuildInputs = [ m4 ];
 
-  doCheck = true;
+  doCheck = flex != null;
 
   meta = {
     homepage = "http://www.gnu.org/software/bison/";