Add --firewire-sdk configuration switch to configure

The configure script only looked into /Developer to find the mac FireWire SDK. Unfortunately the FireWire SDK available on Apple developer site is for i386 and ppc archicture only. As such compilation in 64 bits would fail on mac
The --firewire-sdk allows to point to an alternative SDK, one that would be 64 bits compatible (as new mac build script allow)

Author: jyavenard

mythtv/configure

@@ -110,6 +110,7 @@ Advanced options (experts only):
                            'libcec/cec.h', not the directory
                            with 'cec.h' [$libcec_path_default]
   --disable-firewire       disable support for FireWire cable boxes
+  --firewire-sdk           specify location for mac FireWire SDK [mac only]
   --disable-iptv           disable support for recording RTSP/UDP/RTP streams
   --disable-hdhomerun      disable support for HDHomeRun boxes
   --disable-ceton          disable support for Ceton cards
@@ -1449,6 +1450,7 @@ PATHS_LIST='
     shlibdir
     x11_path
     libxml2_path
+    firewiresdk_path
 '
 
 CMDLINE_SET="
@@ -2027,6 +2029,7 @@ dvb_path_default="${sysroot}/usr/include"
 x11_path_default="${sysroot}/usr/X11R6/include"
 libcec_path_default="${sysroot}/usr/include"
 libxml2_path_default="${sysroot}/usr/include/libxml2"
+firewiresdk_path_default=""
 
 # configurable options
 enable avcodec
@@ -2273,6 +2276,9 @@ for opt do
     ;;
     --help|-h) show_help
     ;;
+    --firewire-sdk=*) firewiresdk_path="${optval}"
+    ;;
+
     *)
     optname="${opt%%=*}"
     optname="${optname#--}"
@@ -4111,16 +4117,20 @@ if enabled firewire; then
     check_libx fwlibs libavc1394/avc1394.h avc1394_transaction_block2 -lavc1394 && check_libx fwlibs libiec61883/iec61883.h iec61883_cmp_reconnect -liec61883 || disable firewire
 
     if test $target_os = darwin; then
-        # This should pick the newest. e.g. FireWireSDK21 instead of 20
-        # Unfortunately, the location keeps changing:
-        #/Developer/FireWireSDK20/Examples/AVCVideoServices/Framework
-        #/Developer/FireWireSDK21/Examples/Framework
-        mac_avc=`find /Developer/FireWireSDK* -name Framework 2> /dev/null \
-                 | tail -n 1`
+        if [ -n "$firewiresdk_path" ] ; then
+            mac_avc="$firewiresdk_path"
+        else
+            # This should pick the newest. e.g. FireWireSDK21 instead of 20
+            # Unfortunately, the location keeps changing:
+            #/Developer/FireWireSDK20/Examples/AVCVideoServices/Framework
+            #/Developer/FireWireSDK21/Examples/Framework
+            mac_avc=`find /Developer/FireWireSDK* -name Framework 2> /dev/null \
+                    | tail -n 1`
+        fi
         if test -d "$mac_avc" ; then
             firewire="yes"
         else
-            echo Firewire being disabled. /Developer/FireWireSDK* missing
+            echo Firewire being disabled. FireWire SDK missing
         fi
     fi
 fi