1 files changed, 4 insertions, 3 deletions
diff --git a/nixpkgs/pkgs/development/tools/misc/gnum4/default.nix b/nixpkgs/pkgs/development/tools/misc/gnum4/default.nix
index 512989a14462..d0b5911b71d9 100644
--- a/nixpkgs/pkgs/development/tools/misc/gnum4/default.nix
+++ b/nixpkgs/pkgs/development/tools/misc/gnum4/default.nix
@@ -5,11 +5,12 @@
 # cgit) that are needed here should be included directly in Nixpkgs as
 # files.
 
-stdenv.mkDerivation {
-  name = "gnum4-1.4.18";
+stdenv.mkDerivation rec {
+  pname = "gnum4";
+  version = "1.4.18";
 
   src = fetchurl {
-    url = "mirror://gnu/m4/m4-1.4.18.tar.bz2";
+    url = "mirror://gnu/m4/m4-${version}.tar.bz2";
     sha256 = "1xkwwq0sgv05cla0g0a01yzhk0wpsn9y40w9kh9miiiv0imxfh36";
   };