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-rw-r--r--pkgs/development/tools/parsing/flex/2.5.35.nix7
1 files changed, 4 insertions, 3 deletions
diff --git a/pkgs/development/tools/parsing/flex/2.5.35.nix b/pkgs/development/tools/parsing/flex/2.5.35.nix
index ec2c9eeb2d1c6..a80e75559df33 100644
--- a/pkgs/development/tools/parsing/flex/2.5.35.nix
+++ b/pkgs/development/tools/parsing/flex/2.5.35.nix
@@ -1,10 +1,11 @@
 { lib, stdenv, fetchurl, autoreconfHook, flex, bison, texinfo, help2man, m4 }:
 
-stdenv.mkDerivation {
-  name = "flex-2.5.35";
+stdenv.mkDerivation rec {
+  pname = "flex";
+  version = "2.5.35";
 
   src = fetchurl {
-    url = "https://github.com/westes/flex/archive/flex-2-5-35.tar.gz";
+    url = "https://github.com/westes/flex/archive/flex-${lib.replaceStrings ["."] ["-"] version}.tar.gz";
     sha256 = "0wh06nix8bd4w1aq4k2fbbkdq5i30a9lxz3xczf3ff28yy0kfwzm";
   };