Fix support for building with ccache

refs #12537

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6c855bd170db975f03257370df4633e04ca969b3..dbb3e7dbff47e0e5c5ac86427be58ed03535cf3e 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -245,8 +245,8 @@ if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     OUTPUT_VARIABLE _ICINGA2_COMPILER_VERSION
   )
 
-  if("${_ICINGA2_COMPILER_VERSION}" VERSION_LESS "4.6.0")
-    message(FATAL_ERROR "Your version of GCC (${_ICINGA2_COMPILER_VERSION}) is too old for building Icinga 2 (GCC >= 4.6.0 is required).")
+  if("${CMAKE_CXX_COMPILER_VERSION}" VERSION_LESS "4.6.0")
+    message(FATAL_ERROR "Your version of GCC (${CMAKE_CXX_COMPILER_VERSION}) is too old for building Icinga 2 (GCC >= 4.6.0 is required).")
   endif()
 endif()