UTS4 1726 gc/include/private/gcconfig.h # ifdef UTS4 UTS4 1984 gc/include/private/gcconfig.h # if defined(SUNOS5) || defined(DRSNX) || defined(UTS4) UTS4 437 gc/mach_dep.c || defined(UTS4) || defined(LINUX) || defined(EWS4800) UTS4 509 gc/os_dep.c # if defined(sigmask) && !defined(UTS4) && !defined(HURD)