Removed metakit and zlib from the configure/build process. The

developer will need to build and install these separately if they don't
have packages already installed by their system.  See README.metakit and
README.zlib for more details.

As a convenience, pristine tarballs of the metakit and zlib source code
trees are included with the simgear distribution (and cvs.)

simgear/xml/Makefile.am

@@ -1,11 +1,5 @@
 includedir = @includedir@/xml
 
-if HAVE_ZLIB
-ZLIB_INCL =
-else
-ZLIB_INCL = -I$(top_srcdir)/src/zlib
-endif
-
 lib_LIBRARIES = libsgxml.a
 
 include_HEADERS = \
@@ -25,7 +19,7 @@ libsgxml_a_SOURCES = \
 	xmltok_impl.h
 
 if OLD_AUTOMAKE
-INCLUDES += -I$(top_srcdir) $(ZLIB_INCL)
+INCLUDES += -I$(top_srcdir)
 else
-INCLUDES = -I$(top_srcdir) $(ZLIB_INCL)
+INCLUDES = -I$(top_srcdir)
 endif