This is a patch for "mathomathic" 16.0.3.  It's intended  for use with
the local distro, and won't work in other contexts.

--- mathomatic-16.0.3.old/primes/makefile
+++ mathomatic-16.0.3/primes/makefile
@@ -21,9 +21,10 @@
 LDLIBS		+= -lm
 
 # Install directories follow, installs everything in $(DESTDIR)/usr/local by default.
-prefix		?= /usr/local
+
+prefix		?= __META_PREFIX__
 bindir		?= $(prefix)/bin
-mandir		?= $(prefix)/share/man
+mandir		?= $(prefix)/man
 
 # The executables to create:
 TARGETS		= matho-primes matho-pascal matho-sumsq