--- udav/CMakeLists.txt	2016-02-15 16:59:57.763709611 +0600
+++ udav/CMakeLists.txt	2016-02-16 10:57:58.345497232 +0600
@@ -38,10 +38,10 @@ endif(enable-qt5)
 add_executable(udav ${udav_src} ${udav_moc_hdr} ${udav_rc_src})
 #set_target_properties(udav PROPERTIES COMPILE_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
 if(enable-qt5)
-	target_link_libraries(udav mgl-qt5)
+	target_link_libraries(udav mgl-qt5 X11)
 	qt5_use_modules(udav ${MGL_QT5_LIBS})
 else(enable-qt5)
-	target_link_libraries(udav mgl-qt4)
+	target_link_libraries(udav mgl-qt4 X11)
 	qt4_use_modules(udav ${MGL_QT4_LIBS})
 endif(enable-qt5)