fix typo

git-svn-id: https://dng.biozentrum.unibas.ch/svn/openstructure/trunk@1880 5a81b35b-ba03-0410-adc8-b2c5c5119f08

CMakeLists.txt

@@ -147,9 +147,9 @@ endfunction()
 if (CMAKE_COMPILER_IS_GNUCXX)
   get_compiler_version(_GCC_VERSION)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall")
-  if (APPLE AND NOT GCC_VERSION MATCHES "42")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden")
-  endif()
+  if (APPLE AND NOT _GCC_VERSION MATCHES "42")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden")
+  endif()
 endif()
 
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY)