treewide: Stop using Qt 5.9

pkgs/development/ruby-modules/gem-config/default.nix

@@ -21,7 +21,7 @@
 , libiconv, postgresql, v8, clang, sqlite, zlib, imagemagick
 , pkgconfig , ncurses, xapian, gpgme, utillinux, tzdata, icu, libffi
 , cmake, libssh2, openssl, libmysqlclient, darwin, git, perl, pcre, gecode_3, curl
-, msgpack, qt59, libsodium, snappy, libossp_uuid, lxc, libpcap, xorg, gtk2, buildRubyGem
+, msgpack, libsodium, snappy, libossp_uuid, lxc, libpcap, xorg, gtk2, buildRubyGem
 , cairo, re2, rake, gobject-introspection, gdk-pixbuf, zeromq, czmq, graphicsmagick, libcxx
 , file, libvirt, glib, vips, taglib, libopus, linux-pam, libidn, protobuf, fribidi, harfbuzz
 , bison, flex, pango, python3, patchelf, binutils, freetds, wrapGAppsHook, atk
@@ -70,11 +70,6 @@ in
     buildInputs = [ cairo pcre xorg.libpthreadstubs xorg.libXdmcp ];
   };
 
-  capybara-webkit = attrs: {
-    buildInputs = [ qt59.qtbase qt59.qtwebkit ] ++ stdenv.lib.optionals stdenv.isDarwin [ darwin.apple_sdk.frameworks.Cocoa ];
-    NIX_CFLAGS_COMPILE = stdenv.lib.optionalString stdenv.isDarwin "-I${libcxx}/include/c++/v1";
-  };
-
   charlock_holmes = attrs: {
     buildInputs = [ which icu zlib ];
   };