diff --git a/config/check_depend.cmake b/config/check_depend.cmake
index f5bda50f2..5f96be58c 100644
--- a/config/check_depend.cmake
+++ b/config/check_depend.cmake
@@ -309,18 +309,18 @@ IF (CMAKE_COMPILER_IS_GNUCXX)
 
   IF ( ${CXX_HAS_VERSION} EQUAL 0 )
     # We are assuming here that -dumpversion is gcc specific.
-    IF( CXX_VERSION MATCHES "4\\.[0-9](\\.[0-9])?" )
-      MESSAGE(STATUS "Detected gcc4: ${CXX_VERSION}")
+    IF( CXX_VERSION MATCHES "[4-5]\\.[0-9](\\.[0-9])?" )
+      MESSAGE(STATUS "Detected gcc4/5: ${CXX_VERSION}")
       SET(RTT_GCC_HASVISIBILITY TRUE)
-    ELSE(CXX_VERSION MATCHES "4\\.[0-9](\\.[0-9])?")
+    ELSE(CXX_VERSION MATCHES "[4-5]\\.[0-9](\\.[0-9])?")
       IF( CXX_VERSION MATCHES "3\\.[0-9](\\.[0-9])?" )
-	MESSAGE(STATUS "Detected gcc3: ${CXX_VERSION}")
+        MESSAGE(STATUS "Detected gcc3: ${CXX_VERSION}")
       ELSE( CXX_VERSION MATCHES "3\\.[0-9](\\.[0-9])?" )
-	MESSAGE("ERROR: You seem to be using gcc version:")
-	MESSAGE("${CXX_VERSION}")
-	MESSAGE( FATAL_ERROR "ERROR: For gcc, Orocos requires version 4.x or 3.x")
+        MESSAGE("ERROR: You seem to be using gcc version:")
+        MESSAGE("${CXX_VERSION}")
+        MESSAGE( FATAL_ERROR "ERROR: For gcc, Orocos requires version 4.x or 3.x")
       ENDIF( CXX_VERSION MATCHES "3\\.[0-9](\\.[0-9])?" )
-    ENDIF(CXX_VERSION MATCHES "4\\.[0-9](\\.[0-9])?")
+    ENDIF(CXX_VERSION MATCHES "[4-5]\\.[0-9](\\.[0-9])?")
   ELSE ( ${CXX_HAS_VERSION} EQUAL 0)
     MESSAGE("Could not determine gcc version: ${CXX_HAS_VERSION}")
   ENDIF ( ${CXX_HAS_VERSION} EQUAL 0)