gwrap: code style nits

pkgs/development/tools/guile/g-wrap/default.nix

@@ -1,30 +1,35 @@
-{ fetchurl, stdenv, guile, libffi, pkgconfig, glib, guile-lib }:
+{ fetchurl, stdenv, guile, guile-lib, libffi, pkgconfig, glib }:
+
+let
+  name = "${pname}-${version}";
+  pname = "g-wrap";
+  version = "1.9.15";
+in stdenv.mkDerivation {
+  inherit name;
 
-stdenv.mkDerivation rec {
-  name = "g-wrap-1.9.15";
   src = fetchurl {
-    url = "mirror://savannah/g-wrap/${name}.tar.gz";
+    url = "mirror://savannah/${pname}/${name}.tar.gz";
     sha256 = "0ak0bha37dfpj9kmyw1r8fj8nva639aw5xr66wr5gd3l1rqf5xhg";
   };
 
-  # Note: Glib support is optional, but it's quite useful (e.g., it's
-  # used by Guile-GNOME).
+  # Note: Glib support is optional, but it's quite useful (e.g., it's used by
+  # Guile-GNOME).
   buildInputs = [ guile pkgconfig glib guile-lib ];
 
   propagatedBuildInputs = [ libffi ];
 
   doCheck = true;
 
-  meta = {
-    description = "G-Wrap, a wrapper generator for Guile";
+  meta = with stdenv.lib; {
+    description = "A wrapper generator for Guile";
     longDescription = ''
-      G-Wrap is a tool (and Guile library) for generating function
-      wrappers for inter-language calls.  It currently only supports
-      generating Guile wrappers for C functions.
+      G-Wrap is a tool (and Guile library) for generating function wrappers for
+      inter-language calls.  It currently only supports generating Guile
+      wrappers for C functions.
     '';
-    homepage = http://www.nongnu.org/g-wrap/;
-    license = stdenv.lib.licenses.lgpl2Plus;
-    maintainers = [ stdenv.lib.maintainers.taktoa ];
-    platforms = stdenv.lib.platforms.linux;
+    homepage = "http://www.nongnu.org/g-wrap/";
+    license = licenses.lgpl2Plus;
+    maintainers = with maintainers; [ taktoa ];
+    platforms = platforms.linux;
   };
 }