Merge pull request #978 from UV-CDAT/udunits-travis-patch

Update udunits2 patch for travis mac builds.

Author: doutriaux1

CMake/cdat_modules/udunits2_external.cmake

@@ -2,13 +2,13 @@ set(udunits_source "${CMAKE_CURRENT_BINARY_DIR}/build/udunits2")
 set(udunits_install "${cdat_EXTERNALS}")
 
 set(udunits_patch_command "")
-#if(APPLE)
-#  # Modified configure file to workaround random flex failures
-#  set(udunits_patch_command
-#    ${CMAKE_COMMAND} -E copy_if_different
-#      "${cdat_CMAKE_SOURCE_DIR}/cdat_modules_extra/udunits2_apple_configure.in"
-#      "${udunits_source}/configure")
-#endif()
+if(APPLE)
+  # Modified configure file to workaround random flex failures
+  set(udunits_patch_command
+    ${CMAKE_COMMAND} -E copy_if_different
+      "${cdat_CMAKE_SOURCE_DIR}/cdat_modules_extra/udunits2_apple_configure.in"
+      "${udunits_source}/configure")
+endif()
 
 ExternalProject_Add(udunits2
   DOWNLOAD_DIR ${CDAT_PACKAGE_CACHE_DIR}