diff --git a/pkgs/applications/terminal-emulators/rxvt-unicode/default.nix b/pkgs/applications/terminal-emulators/rxvt-unicode/default.nix
index e932fcdea05f..f28694db2949 100644
--- a/pkgs/applications/terminal-emulators/rxvt-unicode/default.nix
+++ b/pkgs/applications/terminal-emulators/rxvt-unicode/default.nix
@@ -33,8 +33,6 @@ let
     };
 in
 
-with lib;
-
 stdenv.mkDerivation {
   name = "${pname}-unwrapped-${version}";
   inherit pname version;
@@ -49,8 +47,8 @@ stdenv.mkDerivation {
     [ libX11 libXt libXft ncurses  # required to build the terminfo file
       fontconfig freetype libXrender
       libptytty
-    ] ++ optionals perlSupport [ perl libXext ]
-      ++ optional gdkPixbufSupport gdk-pixbuf;
+    ] ++ lib.optionals perlSupport [ perl libXext ]
+      ++ lib.optional gdkPixbufSupport gdk-pixbuf;
 
   outputs = [ "out" "terminfo" ];
 
@@ -73,19 +71,19 @@ stdenv.mkDerivation {
     ./patches/9.06-font-width.patch
   ]) ++ [
     ./patches/256-color-resources.patch
-  ] ++ optional (perlSupport && versionAtLeast perl.version "5.38") (fetchpatch {
+  ] ++ lib.optional (perlSupport && lib.versionAtLeast perl.version "5.38") (fetchpatch {
     name = "perl538-locale-c.patch";
     url = "https://github.com/exg/rxvt-unicode/commit/16634bc8dd5fc4af62faf899687dfa8f27768d15.patch";
     excludes = [ "Changes" ];
     sha256 = "sha256-JVqzYi3tcWIN2j5JByZSztImKqbbbB3lnfAwUXrumHM=";
-  }) ++ optional stdenv.isDarwin ./patches/makefile-phony.patch;
+  }) ++ lib.optional stdenv.isDarwin ./patches/makefile-phony.patch;
 
   configureFlags = [
     "--with-terminfo=${placeholder "terminfo"}/share/terminfo"
     "--enable-256-color"
-    (enableFeature perlSupport "perl")
-    (enableFeature unicode3Support "unicode3")
-  ] ++ optional emojiSupport "--enable-wide-glyphs";
+    (lib.enableFeature perlSupport "perl")
+    (lib.enableFeature unicode3Support "unicode3")
+  ] ++ lib.optional emojiSupport "--enable-wide-glyphs";
 
   LDFLAGS = [ "-lfontconfig" "-lXrender" "-lpthread" ];
   CFLAGS = [ "-I${freetype.dev}/include/freetype2" ];
@@ -111,7 +109,7 @@ stdenv.mkDerivation {
 
   passthru.tests.test = nixosTests.terminal-emulators.urxvt;
 
-  meta = {
+  meta = with lib; {
     inherit description;
     homepage = "http://software.schmorp.de/pkg/rxvt-unicode.html";
     downloadPage = "http://dist.schmorp.de/rxvt-unicode/Attic/";