[CM] s7, undefined reference errors

[bil at ccrma.Stanford.EDU]

As Kjetil points out, you must have configured Snd
with --with-gmp or somehow created mus-config.h
with WITH_GMP set to 1.  That file does not come with
s7 (on the theory that people will read the instructions).
If you want to use gmp, you'll need -lgmp -lmpfr -lmpc.
If not, just delete whatever is in mus-config.h and
recompile s7, or run configure again (for Snd) without
--with-gmp, make clean, make.