First you need to clarify your "SSE not enabled" error. What program or development tool is giving you that error? Is that the exact wording?
Then you need to determine which CPU you have in your computer. You do that by typing
If that CPU supports SSE, you need to check whether operating system kernel was compiled with SSE support. Most new linux kernels are compiled with that support enabled but you should check your kernel configuration just to be sure.
If your CPU doesn't support SSE or your kernel is not configured properly then you should still be able to develop the code but not to test it on that computer.
To enable Intel compiler to generate SSE instructions use -QxK command line switch in addition to other compilation switches you are using. If you need command line switches for gcc compiler please consult the appropriate documentation for gcc.
Perhaps you are having problems compiling C or C++ code which contains inline assembler with SSE instructions? In that case I am afraid I cannot help you further.