gconf: refresh cache postinstall

Formula/gconf.rb

@@ -1,6 +1,6 @@
 class Gconf < Formula
   desc "GConf is a system for storing user application preferences"
-  homepage "http://projects.gnome.org/gconf/"
+  homepage "https://projects.gnome.org/gconf/"
   url "https://download.gnome.org/sources/GConf/3.2/GConf-3.2.6.tar.xz"
   sha256 "1912b91803ab09a5eed34d364bf09fe3a2a9c96751fde03a4e0cfa51a04d784c"
 
@@ -14,7 +14,15 @@ class Gconf < Formula
 
   def install
     system "./configure", "--disable-debug", "--disable-dependency-tracking",
-                          "--prefix=#{prefix}"
+                          "--disable-silent-rules", "--prefix=#{prefix}",
+                          "--sysconfdir=#{etc}"
     system "make", "install"
+
+    # Refresh the cache post-install, not during install.
+    rm lib/"gio/modules/giomodule.cache"
+  end
+
+  def post_install
+    system Formula["glib"].opt_bin/"gio-querymodules", HOMEBREW_PREFIX/"lib/gio/modules"
   end
 end