Fixed: Link errors under Linux

--HG--
branch : develop

code/CMakeLists.txt

@@ -259,8 +259,10 @@ IF(WITH_QT5)
 
         ADD_QT_LIBRARY(XcbQpa)
         ADD_QT_LIBRARY(PlatformSupport)
-        SET(QT_LIBRARIES ${QT_LIBRARIES} -lX11-xcb -lXi -lSM -lICE -lxcb)
+        SET(QT_LIBRARIES ${QT_LIBRARIES} -lX11-xcb -lXi -lSM -lICE -lxcb -lGL)
+        IF(EXISTS "${QT_LIBRARY_DIR}/libxcb-static.a")
           SET(QT_LIBRARIES ${QT_LIBRARIES} "${QT_LIBRARY_DIR}/libxcb-static.a")
+        ENDIF()
         SET(QT_LIBRARIES ${QT_LIBRARIES} -lfontconfig)
         ADD_QT_LIBRARY(DBus)
       ENDIF()
@@ -332,7 +334,7 @@ IF(WITH_QT5)
           ${CARBON_FRAMEWORK}
           ${SECURITY_FRAMEWORK})
       ELSEIF(UNIX)
-        SET(QT_LIBRARIES ${QT_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT} -ldl)
+        SET(QT_LIBRARIES ${QT_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT} -ldl -lrt)
       ENDIF()
     ELSE()
       SET(QT_LIBRARIES Qt5::Widgets Qt5::Network Qt5::Xml Qt5::Gui Qt5::OpenGL Qt5::Core)