Possibly fixes OSX 10.6 where includes have moved around a bit.

configure.ac

@@ -324,7 +324,7 @@ case $host_os in
        ## AC_DEFINE([HAVE_AIX_CDROM], [1],
        ##     [Define 1 if you have AIX CD-ROM support])
        ;;
-     darwin6*|darwin7*|darwin8*|darwin9*)
+     darwin6*|darwin7*|darwin8*|darwin9*|darwin10*)
        AC_CHECK_HEADERS(IOKit/IOKitLib.h CoreFoundation/CFBase.h, 
                         [have_iokit_h="yes"])
        if test "x$have_iokit_h" = "xyes" ; then 
@@ -345,6 +345,16 @@ case $host_os in
 	     DARWIN_PKG_LIB_HACK="$DARWIN_PKG_LIB_HACK -Wl,-framework,DiskArbitration"
 	 fi
 
+	 case $host_os in
+	   darwin10*)
+	   	darwin_10=1
+		;;
+	   *)
+	   	darwin_10=0
+		;;
+	 esac
+         AC_DEFINE([DARWIN_10_OR_GREATER], [$darwin_10],
+	      [Define 1 if you have Darwin OS X 10 or greater])
 	 AC_SUBST(DARWIN_PKG_LIB_HACK)
 	 LIBCDIO_LIBS="$LIBCDIO_LIBS $DARWIN_PKG_LIB_HACK"
          cd_drivers="${cd_drivers}, Darwin"