m4, or om4, is a portable version of the OpenBSD m4 program.
It is suitable for ensuring standard m4 compliance, for older Unix machines that do not have a free m4 or have a very old m4.
m4 requires a C compiler, a Yacc program, a Lex program, and a make program
to build.
If you need a Yacc program, a dependency-free yacc is available here:
https://github.com/ibara/yacc/
m4 is known to build and run on all *BSD flavors, Linux, Mac OS X, Cygwin,
AIX, and Solaris. It is very likely to run on other Unix flavors; please let
me know if you are using this on a Unix not listed here so that I may add it
to the list.
To build, first install lex and yacc, then run:
$ ./configure
$ make
# make install
Tested on Linux and Mac OS X using TravisCI. *BSD, Cygwin, AIX, and Solaris testing done manually. AIX 5.1L and Solaris 8 are used to help ensure backwards compatibility.
All files are a combination of BSD and ISC licensed files.
See releases tab. Latest is om4-6.6.