--- a/MozillaFirefox/MozillaFirefox.spec	Thu Dec 31 09:27:30 2015 +0100
+++ b/MozillaFirefox/MozillaFirefox.spec	Thu Dec 31 09:44:43 2015 +0100
@@ -69,6 +69,7 @@
 BuildRequires:  dbus-1-glib-devel
 BuildRequires:  fdupes
 BuildRequires:  gcc-c++
+BuildRequires:  libXcomposite-devel
 BuildRequires:  libcurl-devel
 BuildRequires:  libgnomeui-devel
 BuildRequires:  libidl-devel