./configure --with-geotiff=yes does not set libgeotiff

[mloskot]

The ./configure help says that --with-geotiff accepts yes or path. Considering libgeotiff installed on Debian-like distributions, under standard prefix /usr, ./configure --with-geotiff=yes says that geotiff has been detected but actually Makefile files are not generated properly.

This is because detection is based on AC_CHECK_LIB and this test succeeds. However, include directories are set using $with_geotiff value which is yes, so Makefile gets wrong or empty include directory paths.

The solution is to redesign geotiff determination to two tests, distinguishing these cases:

• --with-geotiff=yes - check standard prefixes like /usr and /usr/local for headers and library

• --with-geotiff=/path/to/install/prefox - check given prefix only for all files

[hobu]

Mateusz,

Please strengthen the detection in the geotiff and gdal macros as you see fit (and port it to GDAL where appropriate too, as that's where we stole it from :) )

Howard