The Modula-2 compiler does not work under SunOS 4.1 because of a new bug in /bin/as. If you are running SunOS 4.1 you have two options: (1) Take the GNU assembler (gas-1.36.tar.Z) and the newest Modula-2 distribution (modula-2.2.tar.Z). Install first the GNU assembler and run then the installation script of the Modula-2 distribution. The installation script asks then for the pathname of the assembler. (2) If you have a Modula-2 distribution with version number less than 2.1.4 then fetch fixups/m2c.tar.Z and unpack it in modula/src. Copy /bin/as from SunOS 4.0.3 to the library directory of the Modula-2 compiler ($MODLIB). Edit modula/src/m2c/makefile and change the value of M20AS to the copy of the old assembler. Run install for m2c. Sorry, I've had no time yet to adapt the Modula-2 system to the Sun assembler of SunOS 4.1. Please use gas-1.36. Andreas Borchert