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-rw-r--r--nixpkgs/pkgs/development/tools/parsing/flex/2.5.35.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/tools/parsing/flex/2.5.35.nix b/nixpkgs/pkgs/development/tools/parsing/flex/2.5.35.nix
index c13abf071c56..d6a09929d4f8 100644
--- a/nixpkgs/pkgs/development/tools/parsing/flex/2.5.35.nix
+++ b/nixpkgs/pkgs/development/tools/parsing/flex/2.5.35.nix
@@ -28,6 +28,7 @@ stdenv.mkDerivation rec {
     branch = "2.5.35";
     homepage = "https://flex.sourceforge.net/";
     description = "A fast lexical analyser generator";
+    mainProgram = "flex";
     license = licenses.bsd2;
     platforms = platforms.unix;
   };