It appears that Gauche 0.7.1 runs on PS2Linux, but you should build libgauche as a static library. Extensions seem to work.
SOEXT = a POSTBUILD = POSTINSTALL = libgauche.$(SOEXT) : $(libgauche_OBJECTS) $(GCLIB) ar cru libgauche.$(SOEXT) $(libgauche_OBJECTS) ../gc/.libs/*.o $(POSTBUILD)
Notes: