yacc, or oyacc, is a portable version of the OpenBSD Yacc program.

It is suitable for ensuring standard Yacc compliance, for older Unix machines that do not have a free Yacc or have a very old Yacc, or for users that do not need the bells and whistles of byacc or bison.

yacc has no dependencies other than libc. It 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, 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 C files other than portable.c are 3-clause BSD licensed. portable.c has a combination of Public Domain and ISC licensed code.

See releases tab. Please use the uploaded tarball! Latest version is oyacc-6.6.