[plt-scheme] plt-scheme contains internal copies of zlib, libpng and jpeg

From: Matthew Flatt (mflatt at cs.utah.edu)
Date: Tue Mar 24 12:37:12 EDT 2009

At Tue, 24 Mar 2009 13:37:53 +0100, "Marijn Schouten (hkBst)" wrote:
> After
> doing "rm -rf wxcommon/{jpeg,libpng,zlib}" configure fails thusly:
> config.status: creating mred/Makefile
> config.status: creating mred/wxs/Makefile
> config.status: creating mred/wxme/Makefile
> config.status: creating mred/gc2/Makefile
> config.status: error: cannot find input file: wxcommon/libpng/Makefile.in

The `configure' script now avoids generating the makefiles when the
installed libpng is to be used.

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