GNU/Linux distributions. If you're building GNU m4 1.4 from scratch
we suggest using this version:
-ftp://alpha.gnu.org/gnu/bison/m4-1.4.1.tar.gz
+ftp://ftp.gnu.org/gnu/m4/m4-1.4.2.tar.gz
Older versions of Sun Forte Developer 6 update 2 have a compiler bug
that cause "make check" to fail with a "Encounter BINCL entry"