The following procedure is suggested for installation of O'Hugs on a Unix
machine. 

 1) Make sure the flags for your OS are used in src/Makefile.

 2) Similarly, set the macro for your OS in src/prelude.h.

 3) If you don't have Tcl/Tk, remove stuff from LDFLAGS
    that mentions tcl, tk and X11. Similarly for Tix.
    Check settings for O_TK and O_TIX in src/prelude.h.

 4) Build the interpreter: "make".

 5) Installation directories can be configured in ./Makefile.
    To install interpreter and libraries: "make install".