1 files changed, 3 insertions, 1 deletions

diff --git a/m4/check-libc.m4 b/m4/check-libc.m4
index b58f0b1..54efc37 100644
--- a/m4/check-libc.m4
+++ b/m4/check-libc.m4
@@ -20,10 +20,12 @@ AM_CONDITIONAL([HAVE_TIMEGM], [test "x$ac_cv_func_timegm" = xyes])
 ])
 
 AC_DEFUN([CHECK_SYSCALL_COMPAT], [
-AC_CHECK_FUNCS([accept4 pledge poll])
+AC_CHECK_FUNCS([accept4 pipe2 pledge poll socketpair])
 AM_CONDITIONAL([HAVE_ACCEPT4], [test "x$ac_cv_func_accept4" = xyes])
+AM_CONDITIONAL([HAVE_PIPE2], [test "x$ac_cv_func_pipe2" = xyes])
 AM_CONDITIONAL([HAVE_PLEDGE], [test "x$ac_cv_func_pledge" = xyes])
 AM_CONDITIONAL([HAVE_POLL], [test "x$ac_cv_func_poll" = xyes])
+AM_CONDITIONAL([HAVE_SOCKETPAIR], [test "x$ac_cv_func_socketpair" = xyes])
 ])
 
 AC_DEFUN([CHECK_B64_NTOP], [