Merge pull request #1323 from UV-CDAT/osx_sdk_determination_corrected

checking wrong part of version for OS SDK determination

Author: aashish24

CMakeLists.txt

@@ -120,17 +120,17 @@ if(APPLE)
     set(HAVE_10_10_SDK TRUE)
   endif()
   # Try for the lowest version SDK we can
-  if ((${OSX_VER_MAJOR} VERSION_EQUAL 8) AND (HAVE_10_8_SDK))
+  if ((${OSX_VER_MINOR} VERSION_EQUAL 8) AND (HAVE_10_8_SDK))
     set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -headerpad_max_install_names")
     set(CMAKE_OSX_DEPLOYMENT_TARGET 10.8 CACHE STRING "" FORCE)
     set(CMAKE_OSX_SYSROOT "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk" CACHE PATH "" FORCE)
-  elseif((${OS_X_VER_MAJOR} VERSION_EQUAL 9) AND (HAVE_10_9_SDK))
+  elseif((${OSX_VER_MINOR} VERSION_EQUAL 9) AND (HAVE_10_9_SDK))
     set(CMAKE_C_COMPILER clang)
     set(CMAKE_CXX_COMPILER clang++)
     set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -headerpad_max_install_names")
     set(CMAKE_OSX_DEPLOYMENT_TARGET 10.9 CACHE STRING "" FORCE)
     set(CMAKE_OSX_SYSROOT "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk" CACHE PATH "" FORCE)
-  elseif((${OSX_VER_MAJOR} VERSION_EQUAL 10) AND (HAVE_10_10_SDK))
+  elseif((${OSX_VER_MINOR} VERSION_EQUAL 10) AND (HAVE_10_10_SDK))
     set(CMAKE_C_COMPILER clang)
     set(CMAKE_CXX_COMPILER clang++)
     set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -headerpad_max_install_names")