- dnl Prerequisites of lib/pipe.h.
- AC_CHECK_HEADERS_ONCE(unistd.h)
- dnl Prerequisites of lib/pipe.c.
- AC_REQUIRE([AC_C_INLINE])
- AC_REQUIRE([AC_TYPE_MODE_T])
- AC_REQUIRE([AC_FUNC_FORK])
- AC_CHECK_FUNCS(posix_spawn)
+ AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+
+ AC_CHECK_FUNCS_ONCE([pipe])
+ if test $ac_cv_func_pipe != yes; then
+ HAVE_PIPE=0
+ AC_LIBOBJ([pipe])
+ fi