I'm not sure this is the right mailing list. I'm trying to port to IBM z/OS, using the IBM c89 compiler. Has anyone done this or can someone give me some help. From what I can tell, there are a lot of checks for _IBMCPP in the code. They, however, assume AIX and vacpp. I guess architecture checks would have to be added to the mix. For what it's worth, pwd.c in boost_1_33_1/tools/build/jam_src, assumes PATH_MAX is defined. Unfortunately, z/OS doesn't define it, since the maximum path names vary depending on the file system, hfs, zfs or MVS. I've kludged around it by #define PATH_MAX _POSIX_PATH_MAX, but the "correct" solution would probably be to use pathconf. Thanks, Harry