1 files changed, 5 insertions, 1 deletions

diff --git a/m4/check-libc.m4 b/m4/check-libc.m4
index f1ba611..c189ac9 100644
--- a/m4/check-libc.m4
+++ b/m4/check-libc.m4
@@ -1,11 +1,15 @@
 AC_DEFUN([CHECK_LIBC_COMPAT], [
+# Check for libc headers
+AC_CHECK_HEADERS([err.h readpassphrase.h])
 # Check for general libc functions
-AC_CHECK_FUNCS([asprintf inet_pton memmem poll reallocarray])
+AC_CHECK_FUNCS([accept4 asprintf inet_pton memmem poll readpassphrase reallocarray])
 AC_CHECK_FUNCS([strlcat strlcpy strndup strnlen strsep strtonum])
+AM_CONDITIONAL([HAVE_ACCEPT4], [test "x$ac_cv_func_accept4" = xyes])
 AM_CONDITIONAL([HAVE_ASPRINTF], [test "x$ac_cv_func_asprintf" = xyes])
 AM_CONDITIONAL([HAVE_INET_PTON], [test "x$ac_cv_func_inet_pton" = xyes])
 AM_CONDITIONAL([HAVE_MEMMEM], [test "x$ac_cv_func_memmem" = xyes])
 AM_CONDITIONAL([HAVE_POLL], [test "x$ac_cv_func_poll" = xyes])
+AM_CONDITIONAL([HAVE_READPASSPHRASE], [test "x$ac_cv_func_readpassphrase" = xyes])
 AM_CONDITIONAL([HAVE_REALLOCARRAY], [test "x$ac_cv_func_reallocarray" = xyes])
 AM_CONDITIONAL([HAVE_STRLCAT], [test "x$ac_cv_func_strlcat" = xyes])
 AM_CONDITIONAL([HAVE_STRLCPY], [test "x$ac_cv_func_strlcpy" = xyes])