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m4: Compatibility

 
 16 Compatibility with other versions of 'm4'
 ********************************************
 
 This chapter describes the many of the differences between this
 implementation of 'm4', and of other implementations found under UNIX,
 such as System V Release 4, Solaris, and BSD flavors.  In particular, it
 lists the known differences and extensions to POSIX. However, the list
 is not necessarily comprehensive.
 
    At the time of this writing, POSIX 2001 (also known as IEEE Std
 1003.1-2001) is the latest standard, although a new version of POSIX is
 under development and includes several proposals for modifying what 'm4'
 is required to do.  The requirements for 'm4' are shared between SUSv3
 and POSIX, and can be viewed at
 <http://www.opengroup.org/onlinepubs/000095399/utilities/m4.html>.
 

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· Extensions                  Extensions in GNU M4
· Incompatibilities           Facilities in System V m4 not in GNU M4
· Other Incompatibilities     Other incompatibilities
 

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