+# For ping library
+AC_CHECK_HEADERS(netinet/in_systm.h)
+AC_CHECK_HEADERS(netinet/in.h, [], [],
+[#if HAVE_NETINET_IN_SYSTM_H
+# include <netinet/in_systm.h>
+#endif
+])
+AC_CHECK_HEADERS(netinet/ip.h, [], [],
+[#if HAVE_NETINET_IN_SYSTM_H
+# include <netinet/in_systm.h>
+#endif
+#if HAVE_NETINET_IN_H
+# include <netinet/in.h>
+#endif
+])
+AC_CHECK_HEADERS(netinet/ip_icmp.h, [], [],
+[#if HAVE_NETINET_IN_SYSTM_H
+# include <netinet/in_systm.h>
+#endif
+#if HAVE_NETINET_IN_H
+# include <netinet/in.h>
+#endif
+#if HAVE_NETINET_IP_H
+# include <netinet/ip.h>
+#endif
+])
+AC_CHECK_HEADERS(netinet/ip_var.h, [], [],
+[#if HAVE_NETINET_IN_SYSTM_H
+# include <netinet/in_systm.h>
+#endif
+#if HAVE_NETINET_IN_H
+# include <netinet/in.h>
+#endif
+#if HAVE_NETINET_IP_H
+# include <netinet/ip.h>
+#endif
+])
+AC_CHECK_HEADERS(netinet/ip6.h, [], [],
+[#if HAVE_NETINET_IN_SYSTM_H
+# include <netinet/in_systm.h>
+#endif
+#if HAVE_NETINET_IN_H
+# include <netinet/in.h>
+#endif
+])
+AC_CHECK_HEADERS(netinet/icmp6.h, [], [],
+[#if HAVE_NETINET_IN_SYSTM_H
+# include <netinet/in_systm.h>
+#endif
+#if HAVE_NETINET_IN_H
+# include <netinet/in.h>
+#endif
+#if HAVE_NETINET_IP6_H
+# include <netinet/ip6.h>
+#endif
+])
+