I've tried building pspp for you, but I stuck on what is probably a small problem on the final build.
I think someone with a little more experience than me will be able to solve it though.
Here are some details...
The prerequisite dependencies which I downloaded, built and installed are plotutils-2.41, and gsl-1.11.
That went fine.
Then when I run the .SlackBuild for pspp I get this error at the end.
gcc: /usr/lib/libgsl.so: no such file or directory
gcc: /usr/lib/libgslcblas.so: no such file or directory.
However, I have them just named slighly different.
I have libgsl.so.0 and libgslcblas.so.0
What flag, option, symbolic link kinda thingy can I do to make the build see the new filenames.