+pspp under macports will be linked against the macports libraries. The configure
+script has to be informed about the library and header locations. Assume the following
+directory structure for an out of tree build:
+
+~/mypspp
+ |----pspp (This is the pspp git directory)
+ |----install (The install location containing also ui files for psppire)
+ |----build (The build directory)
+ |----gnulib (The gnulib directory as described above)
+
+Then you can build with the following commands: