* Info: Using [gentoo] (https://bugs.gentoo.org/xmlrpc.cgi)
 * Info: Getting attachment 403034
 * Info: Viewing attachment: "X11.patch"
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 60ec98f..03443a7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -225,6 +225,7 @@ set(I18N_LANGUAGE "" CACHE STRING "Build i18n only for selected language")
 
 find_package(Qt4 4.6.0 REQUIRED) # find and setup Qt4 for this project
 find_package(OpenGL REQUIRED) # find and setup OpenGL
+find_package(X11 REQUIRED)
 find_package(Linguist) # find and setup Linguist
 if(NOT Linguist_FOUND)
   message(WARNING " Qt4 Linguist not found, please install it if you want Avogadro translations")