[OpenSlide] LibTiff dependency

[Benjamin Gilbert]

On 07/08/2014 05:14 AM, Sebastian Schmittner wrote:
> I am compiling OpenSlide in Ubuntu 12.04.04 and during configure it
> states that libtiff was not found.
>
> *checking for LIBTIFF... no*
> *checking for library containing TIFFOpen... -ltiff*

The messages are a little unclear, but actually this means it's working. 
  The first check looks for the pkg-config file provided by libtiff 4, 
and the second check looks for libtiff 3 by hand.  libtiff is required, 
so if it hadn't been found at all, configure would have failed.

--Benjamin Gilbert