1#unconditional
2PER_LINUX
3PER_LINUX_32BIT
4PER_LINUX_FDPIC
5PER_SVR4
6PER_SVR3
7PER_SCOSVR3
8PER_OSR5
9PER_WYSEV386
10PER_ISCR4
11PER_BSD
12PER_SUNOS
13PER_XENIX
14PER_LINUX32
15PER_LINUX32_3GB
16PER_IRIX32
17PER_IRIXN32
18PER_IRIX64
19PER_RISCOS
20PER_SOLARIS
21PER_UW7
22PER_OSF4
23PER_HPUX
24