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Date: Sat, 26 Dec 2020 14:57:26 -0600 (CST)
From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
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Subject: Re: [Tiff] Wrong information about request and avalability of
 external codecs
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On Sat, 26 Dec 2020, Roger Leigh wrote:

>
>> On 26 Dec 2020, at 19:47, miguel medalha <medalist@sapo.pt> wrote:
>
> The CMake logic is a direct copy of the Autoconf configure.ac logic.  I think in this case we could improve it a bit.  The root cause of the problems is that we only check for a library if specifically requested.  For example:

The only settings which really matter for Autoconf are 'enable' 
(AC_ARG_ENABLE) and 'with' (AC_ARG_WITH) as known to Autoconf.  For 
example 'enable_zlib' is a true Autoconf flag option, and 
--with-zlib-include-dir is a completely unneccessary convenience 
option which does not turn anything on or off.

Finding the component does depend on the compiler finding the headers 
and libraries, which may require some user assistance.

Bob
-- 
Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
Public Key,     http://www.simplesystems.org/users/bfriesen/public-key.txt
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