Made tcpdump crossbuild.

svn path=/nixpkgs/trunk/; revision=20543

pkgs/development/libraries/libpcap/default.nix

@@ -8,11 +8,17 @@ stdenv.mkDerivation rec {
     sha256 = "1h3kmj485qz1i08xs4sc3a0bmhs1rvq0h7gycs7paap2szhw8552";
   };
   
-  buildInputs = [ flex bison ];
+  buildNativeInputs = [ flex bison ];
   
   configureFlags = "--with-pcap=linux";
 
   preInstall = ''ensureDir $out/bin'';
   
   patches = [ ./libpcap_amd64.patch ];
+
+  crossAttrs = {
+    # Stripping hurts in static libraries
+    dontStrip = true;
+    configureFlags = [ "--with-pcap=linux" "ac_cv_linux_vers=2" ];
+  };
 }

pkgs/tools/networking/tcpdump/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, libpcap }:
+{ stdenv, fetchurl, libpcap, enableStatic ? false }:
 
 stdenv.mkDerivation rec {
   name = "tcpdump-4.0.0";
@@ -10,6 +10,14 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ libpcap ];
 
+  patches = [ ./disable-ipv6.patch ];
+
+  crossAttrs = {
+    LDFLAGS = if enableStatic then "-static" else "";
+    configureFlags = [ "ac_cv_linux_vers=2" ] ++ (stdenv.lib.optional
+      (stdenv.cross.platform.kernelMajor == "2.4") "--disable-ipv6");
+  };
+
   meta = {
     description = "tcpdump, a famous network sniffer";
     homepage = http://www.tcpdump.org/;

pkgs/tools/networking/tcpdump/disable-ipv6.patch

@@ -0,0 +1,17 @@
+Needed for proper building with ipv6 disabled
+http://marc.info/?l=tcpdump-workers&m=122606195828825&w=2
+--- a/print-enc.c	2008-11-04 16:24:30 +0000
++++ b/print-enc.c	2008-11-04 16:45:04 +0000
+@@ -77,9 +77,11 @@
+ 	case AF_INET:
+ 		ip_print(gndo, p, length);
+ 		break;
++#ifdef INET6
+ 	case AF_INET6:
+ 		ip6_print(p, length);
+ 		break;
++#endif /*INET6*/
+ 	}
+ 
+ out:
+