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-rw-r--r--pkgs/development/tools/parsing/flex/2.5.35.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/development/tools/parsing/flex/2.5.35.nix b/pkgs/development/tools/parsing/flex/2.5.35.nix
index 14209225bc6..97ee871c87e 100644
--- a/pkgs/development/tools/parsing/flex/2.5.35.nix
+++ b/pkgs/development/tools/parsing/flex/2.5.35.nix
@@ -23,5 +23,6 @@ stdenv.mkDerivation {
     branch = "2.5.35";
     homepage = http://flex.sourceforge.net/;
     description = "A fast lexical analyser generator";
+    platforms = stdenv.lib.platforms.unix;
   };
 }