diff --git a/configure.in b/configure.in
index 286ececff..3ee407984 100644
--- a/configure.in
+++ b/configure.in
@@ -520,6 +520,9 @@ AC_SUBST([SCM_I_GSC_T_UINTMAX])
 AC_SUBST([SCM_I_GSC_NEEDS_STDINT_H])
 AC_SUBST([SCM_I_GSC_NEEDS_INTTYPES_H])
 
+AC_CHECK_TYPE(socklen_t, int)
+AC_CHECK_TYPE(struct ip_mreq)
+
 AC_HEADER_STDC
 AC_HEADER_DIRENT
 AC_HEADER_TIME