fixed again configure.ac and .gitignore

.gitignore

@@ -35,7 +35,9 @@ aclocal.m4
 archive.tar.gz
 autom4te*
 build
-m4
+m4/*
+!m4/p0f.m4
+!m4/ax_lib_socket_nsl.m4
 build-aux
 cat-id-tbl.c
 .ccache

configure.ac

@@ -22,6 +22,7 @@ AC_PROG_MAKE_SET
 
 # Checks for libraries.
 AC_MSG_CHECKING([checking for pcap library]) 
+LIB_SOCKET_NSL
 have_pcap=no
 AC_PATH_TOOL(PCAP_CONFIG, pcap-config)
 AS_IF([test -n "$PCAP_CONFIG"],

m4/ax_lib_socket_nsl.m4

@@ -0,0 +1,40 @@
+# ===========================================================================
+#     http://www.gnu.org/software/autoconf-archive/ax_lib_socket_nsl.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_LIB_SOCKET_NSL
+#
+# DESCRIPTION
+#
+#   This macro figures out what libraries are required on this platform to
+#   link sockets programs.
+#
+#   The common cases are not to need any extra libraries, or to need
+#   -lsocket and -lnsl. We need to avoid linking with libnsl unless we need
+#   it, though, since on some OSes where it isn't necessary it will totally
+#   break networking. Unisys also includes gethostbyname() in libsocket but
+#   needs libnsl for socket().
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Russ Allbery <[email protected]>
+#   Copyright (c) 2008 Stepan Kasal <[email protected]>
+#   Copyright (c) 2008 Warren Young <[email protected]>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 6
+
+AU_ALIAS([LIB_SOCKET_NSL], [AX_LIB_SOCKET_NSL])
+AC_DEFUN([AX_LIB_SOCKET_NSL],
+[
+	AC_SEARCH_LIBS([gethostbyname], [nsl])
+	AC_SEARCH_LIBS([socket], [socket], [], [
+		AC_CHECK_LIB([socket], [socket], [LIBS="-lsocket -lnsl $LIBS"],
+		[], [-lnsl])])
+])

acinclude.m4 → m4/p0f.m4

@@ -53,3 +53,6 @@ AS_VAR_POPDEF([p0f_ldflags])dnl
 AS_VAR_POPDEF([p0f_my_ldflags])dnl
 m4_ifval([$2], [AS_LITERAL_IF([$2], [AC_SUBST([$2])], [])])dnl
 ])
+
+
+