#unconditional
PER_LINUX
PER_LINUX_32BIT
PER_LINUX_FDPIC
PER_SVR4
PER_SVR3
PER_SCOSVR3
PER_OSR5
PER_WYSEV386
PER_ISCR4
PER_BSD
PER_SUNOS
PER_XENIX
PER_LINUX32
PER_LINUX32_3GB
PER_IRIX32
PER_IRIXN32
PER_IRIX64
PER_RISCOS
PER_SOLARIS
PER_UW7
PER_OSF4
PER_HPUX