diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_NETDB_H.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_NETDB_H.h
new file mode 100644
index 0000000..55b9b36
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_NETDB_H.h
@@ -0,0 +1,16 @@
+// HAVE_NETDB_H : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_NETDB_H
+
+/* Since BSD 4.2 (1983) */
+#if defined(__FreeBSD__)            || \
+    defined(__OpenBSD__)            || \
+    defined(__NetBSD__)             || \
+    defined(__GLIBC__)              || \
+    defined(BUILD2_AUTOCONF_MACOS)
+#  define HAVE_NETDB_H 1
+#endif