AC_DEFUN([PU_SYSTEM],[
AC_REQUIRE([AC_HEADER_STDC])
AC_CHECK_HEADERS_ONCE([string.h memory.h fcntl.h sys/wait.h \
sys/gentape.h sys/tape.h sys/device.h sys/param.h sys/tprintf.h sys/mtio.h \
sgtty.h sys/io/trioctl.h locale.h])
AC_CHECK_HEADERS([sys/buf.h], [], [],
[
AC_REQUIRE([AC_HEADER_TIME])
AC_CHECK_MEMBERS([struct stat.st_blksize]) AC_REQUIRE([AC_STRUCT_ST_BLOCKS])
AC_REQUIRE([AC_STRUCT_ST_BLKSIZE])
AC_CHECK_FUNCS_ONCE(lstat mkfifo setlocale)
AC_REQUIRE([gl_INTTYPES_H])
AC_REQUIRE([gl_STDINT_H])
])