I believe t/gis_proj.t is broken in two ways. First of all, one of the tests fails and probably should be fixed (I don't understand what it's doing, though). Secondly, I set all the PDL::GIS::Proj settings in perldl.conf to 0 but gis_proj.t still runs and fails. Proj is installed.
Rel. 4.6.0, 21 Dec 2007
$ prove -d t/gis_proj.t
# 1 tests to run
t/gis_proj....# Running: /usr/bin/perl5.8.8 t/gis_proj.t
t/gis_proj....ok 1/15_fwd_trans(): Projection initialization failed: major axis or radius = 0 or not given
# Looks like you planned 15 tests but only ran 4.
# Looks like your test died just after 4.
Test returned status 255 (wstat 65280, 0xff00)
DIED. FAILED tests 5-15
Failed 11/15 tests, 26.67% okay