# some standard header files
AC_HEADER_DIRENT
AC_HEADER_MAJOR
-AC_CHECK_HEADERS(sys/time.h sys/types.h sys/select.h strings.h locale.h utime.h sys/utime.h)
+AC_CHECK_HEADERS(sys/time.h sys/types.h sys/select.h strings.h locale.h utime.h sys/utime.h io.h process.h)
# some standard structures
AC_HEADER_STAT
dnl We aim to remove this eventually, since we should test as much as
dnl possible with the compiler which will use the functions (JMarc)
AC_LANG_PUSH(C)
-AC_CHECK_FUNCS(mkfifo mkstemp mktemp lstat readlink)
+AC_CHECK_FUNCS(close _close getpid _getpid lstat mkfifo mkstemp mktemp open _open pclose _pclose popen _popen readlink)
AC_LANG_POP(C)
LYX_CHECK_SPELL_ENGINES