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DEPRECATION

This module is not compatible with newer release of libproj: it only supports version 4, which has been around for about 25 years. Since version 5 (2018), libproj has totally redesigned its interface. This is good for performance, this is good for the quality of the results... but the death of Geo::Proj4 and some of its derived modules.

Installing the old library

When you have to port legacy code to systems which come with a newer version of the proj library can still install proj4 by hand.

installing proj4 on OpenSuSE 15.2

I downgraded the installed libproj library version to 'proj4', which was still provided. Then simply

cpan install Geo::Proj4

After that, I installed the newest libproj version as parallel install, is supported for that package.

installing proj4 on ubuntu 20.04

Description contributed by Roberto Bianconi. I hope this works for you as well. Please contribute alternative methods.

# This will install libproj5, which is incompatible
apt-get install libgdal-perl gdal-bin
gdalinfo --help

apt install subversion unzip
cd /usr/local/src
svn co http://svn.osgeo.org/metacrs/proj/branches/4.8/proj/
wget http://download.osgeo.org/proj/proj-datumgrid-1.5.zip
mv proj-datumgrid-1.5.zip /usr/local/src/proj/nad
cd /usr/local/src/proj/nad
unzip proj-datumgrid-1.5.zip
cd /usr/local/src/proj
./configure  &&  make  && make install
ldconfig

perl -MCPAN -e shell
cpan[1]>  look Geo::Proj4
vi Makefile.PL
# add: , INC      => "-I. -I/usr/local/src/proj/src"

perl Makefile.PL
make install
exit

cpan[2]> exit
perl -e "use Geo::Proj4;"    # Works!!!