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-rw-r--r--pkgs/development/tools/parsing/byacc/default.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/development/tools/parsing/byacc/default.nix b/pkgs/development/tools/parsing/byacc/default.nix
index 5be797507c0..fdfac484bf1 100644
--- a/pkgs/development/tools/parsing/byacc/default.nix
+++ b/pkgs/development/tools/parsing/byacc/default.nix
@@ -12,5 +12,6 @@ stdenv.mkDerivation {
     description = "Berkeley YACC";
     homepage = http://dickey.his.com/byacc/byacc.html;
     license = stdenv.lib.licenses.publicDomain;
+    platforms = stdenv.lib.platforms.unix;
   };
 }