old libtiff incompatible with gdal trunk

[warmerdam]

Hi there,

Downloading the nightly source distribution gdal-svn-trunk-2008.11.20.tar.gz on a RedHat Linux,

$ cat /etc/redhat-release
Enterprise Linux Enterprise Linux AS release 4 (October Update 7)

It is resulting in a error on gt_overview

% ./configure --prefix=/home/joe/utils/gdal
% make
...
Error:
 gt_overview.cpp:75: error: `TIFFFreeDirectory' was not declared in this scope
 gt_overview.cpp:75: warning: unused variable 'TIFFFreeDirectory'
 make[2]: *** [../o/gt_overview.o] Error 1
 make[2]: Leaving directory
 `/home/joe/GDAL/gdal-svn-trunk-2008.11.20/frmts/gtiff'
 make[1]: *** [gtiff-install-obj] Error 2
 make[1]: Leaving directory
 `/home/joe/GDAL/gdal-svn-trunk-2008.11.20/frmts'
 make: *** [frmts-target] Error 2

GDAL should be able to build and run with older versions of libtiff, even if there is some esoteric functionality that is broken.