diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_ARPA_INET_H.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_ARPA_INET_H.h
new file mode 100644
index 0000000..b4c3ff4
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_ARPA_INET_H.h
@@ -0,0 +1,16 @@
+// HAVE_ARPA_INET_H : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_ARPA_INET_H
+
+/* Since BSD 4.2 (1983) */
+#if defined(__FreeBSD__)            || \
+    defined(__OpenBSD__)            || \
+    defined(__NetBSD__)             || \
+    defined(__GLIBC__)              || \
+    defined(BUILD2_AUTOCONF_MACOS)
+#  define HAVE_ARPA_INET_H 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_INET_NTOP.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_INET_NTOP.h
new file mode 100644
index 0000000..1628d29
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_INET_NTOP.h
@@ -0,0 +1,16 @@
+// HAVE_INET_NTOP : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_INET_NTOP
+/* Since BSD 4.2 (1983)
+ */
+#if defined(__linux__)   || \
+    defined(__FreeBSD__) || \
+    defined(__OpenBSD__) || \
+    defined(__NetBSD__)  || \
+    defined(BUILD2_AUTOCONF_MACOS)
+#  define HAVE_INET_NTOP 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_INET_PTON.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_INET_PTON.h
new file mode 100644
index 0000000..4b9bcad
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_INET_PTON.h
@@ -0,0 +1,16 @@
+// HAVE_INET_PTON : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_INET_PTON
+/* Since BSD 4.2 (1983)
+ */
+#if defined(__linux__)   || \
+    defined(__FreeBSD__) || \
+    defined(__OpenBSD__) || \
+    defined(__NetBSD__)  || \
+    defined(BUILD2_AUTOCONF_MACOS)
+#  define HAVE_INET_PTON 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_NETINET_IN6_H.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_NETINET_IN6_H.h
new file mode 100644
index 0000000..6bc20e4
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_NETINET_IN6_H.h
@@ -0,0 +1,17 @@
+// HAVE_NETINET_IN6_H : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_NETINET_IN6_H
+
+/* No decent info...
+*/
+#if defined(__linux__)   || \
+    defined(__FreeBSD__) || \
+    defined(__OpenBSD__) || \
+    defined(__NetBSD__)  || \
+    defined(BUILD2_AUTOCONF_MACOS)
+#  define HAVE_NETINET_IN6_H 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_NETINET_IN_H.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_NETINET_IN_H.h
new file mode 100644
index 0000000..cfe823b
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_NETINET_IN_H.h
@@ -0,0 +1,17 @@
+// HAVE_NETINET_IN_H : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_NETINET_IN_H
+
+/* Since 4.2BSD
+*/
+#if defined(__linux__)   || \
+    defined(__FreeBSD__) || \
+    defined(__OpenBSD__) || \
+    defined(__NetBSD__)  || \
+    defined(BUILD2_AUTOCONF_MACOS)
+#  define HAVE_NETINET_IN_H 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_NETINET_TCP_H.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_NETINET_TCP_H.h
new file mode 100644
index 0000000..b2c72d5
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_NETINET_TCP_H.h
@@ -0,0 +1,17 @@
+// HAVE_NETINET_TCP_H : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_NETINET_TCP_H
+
+/* Since 4.2BSD
+*/
+#if defined(__linux__)   || \
+    defined(__FreeBSD__) || \
+    defined(__OpenBSD__) || \
+    defined(__NetBSD__)  || \
+    defined(BUILD2_AUTOCONF_MACOS)
+#  define HAVE_NETINET_TCP_H 1
+#endif