Doug McIlroy <doug(a)cs.dartmouth.edu> wrote: But it's source has been part of UNIX 32V, so it has become part of the historical UNIX licensed parts and I could take the source to create a modern K&R cpp with the features seen on Solaris in /lib/cpp. BTW: I had to do this port and the related enhancements because "dtrace", "asm" and "rpcgen" depend on a K&R cpp that does not destroy line breaks and that marks include levels. OpenSolaris requires this "cpp" for compilation. See: https://sourceforge.net/p/schillix-on/schillix-on/ci/default/tree/usr/src/c… Also see the original README from the "cpp" directory in 32V: /*--------------------------------------------------------------------------*/ August 25, 1978 Files in this directory form the C preprocessor, which handles '#include' files and macro definition and expansion for the C compiler. This new version was written by John F. Reiser and is from 5 to 12 times faster (on UNIX systems) than the old. To create the executable file 'cpp' in the current directory: make ... /*--------------------------------------------------------------------------*/ Jörg -- EMail:joerg@schily.net (home) Jörg Schilling D-13353 Berlin joerg.schilling(a)fokus.fraunhofer.de (work) Blog: http://schily.blogspot.com/ URL: http://cdrecord.org/private/ http://sourceforge.net/projects/schilytools/files/