I am hoping that you are trying to install support package on the Mac os x. If not, please let me know.
We have seen this issue on Mac and fixed it in the latest version of support package. The latest Support Package is available for download after 23rd April.You can wait for the latest version of the support package to be available for the download.
Meanwhile, you can do the following if you have no issues to remove the SDL framework available on your machine.
1) Open the Mac terminal and run the following command to remove the SDL library available on your machine.
>> rm -rf /Library/Frameworks/SDL.framework
2) Then you can start installing the support package. You should not see any issues in the installation. NOTE : We download and install the SDL 1.2.25 version as a part of support package installation.