Resolve "Cmake on centos 7.5"

Closes #376 (closed)

cmake/CorsikaDefines.cmake

@@ -14,10 +14,15 @@ endif ()
 #
 if (${CMAKE_SYSTEM_NAME} MATCHES "Windows")
     set (CORSIKA_OS_WINDOWS TRUE)
-     set (CORSIKA_OS "Windows")
+    set (CORSIKA_OS "Windows")
 elseif (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
     set (CORSIKA_OS_LINUX TRUE)
-     set (CORSIKA_OS "Linux")
+    set (CORSIKA_OS "Linux")
+    # check for RedHat/CentOS compiler from the software collections (scl)
+    string (FIND ${CMAKE_CXX_COMPILER} "/opt/rh/devtoolset-" index)
+    if (${index} EQUAL 0)
+      set (CORSIKA_SCL_CXX TRUE)
+    endif ()
 elseif (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
     set (CORSIKA_OS_MAC TRUE)  
     set (CORSIKA_OS "Mac")