Supported operating systems: Linux glib 2.1 / 2.2 (e.g. RedHat 6.x/7.x, Debian 2.2, SuSE 6.4 / 7.2, Mandrake 8.1, and others), Sparc Solaris 2.x, FreeBSD 3.4 / 4.0, Windows(r) NT 4.0 / 2000 / XP. Solaris i386, OpenBSD, & Mac OS X supported by the Zend Optimizer 1.2.0.