last minute changes to cmake files

CMakeLists.txt

@@ -34,7 +34,7 @@ set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
 option(CCP4 "The location where ccp4 is installed" "")
 option(CCP4 "The location where ccp4 is installed" "")
 if(DEFINED CCP4 AND EXISTS ${CCP4})
 if(DEFINED CCP4 AND EXISTS ${CCP4})
 	set(CLIBD ${CCP4}/lib/data)
 	set(CLIBD ${CCP4}/lib/data)
-elseif(EXISTS $ENV{CCP4})
+elseif(EXISTS "$ENV{CCP4}")
 	set(CCP4 $ENV{CCP4})
 	set(CCP4 $ENV{CCP4})
 	set(CLIBD ${CCP4}/lib/data)
 	set(CLIBD ${CCP4}/lib/data)
 endif()
 endif()