Unixes with thread support
Solaris 2.5, 2.6 and 2.7 with native threads on sparc and x86
SunOS 4.x with the included MIT-pthreads package
BSDI 2.x with the included MIT-pthreads package
BSDI 3.0 and 3.1 with native threads
SGI IRIX 6.x with native threads
AIX 4.x with native threads
DEC UNIX 4.x with native threads
Linux 2.0+ with LinuxThreads 0.7.1 or glibc 2.0.7
FreeBSD 2.x with the included MIT-pthreads package
FreeBSD 3.x with native threads
SCO OpenServer with a recent port of the FSU-threads package
NetBSD 1.3 Intel and NetBSD 1.3 Alpha
OpenBSD 2.x with the included MIT-pthreads package
HP-UX 10.20 with the included MIT-pthreads package