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Psd is known to work with Aubrey Jaffer's scm, Oliver Laumann's elk, and sci (the interpreter in the Scheme to C compiler system).
By default psd assumes that you are using slib, the utility library maintained by Aubrey Jaffer. Psd tries to find the file psd-slib.scm, and complains if it can not find it. If you are not using slib, set the Emacs variable psd-using-slib to nil, for example in your .emacs:
(setq psd-using-slib nil)
If psd-using-slib is nil, psd first tries to find the file psd-foo.scm, where foo is the value of the Emacs variable scheme-program-name, and if it is not found, it loads the file psd.scm.