add distro metadata, use pp_setversion

Makefile.PL

@@ -2,16 +2,11 @@ use strict;
 use warnings;
 use ExtUtils::MakeMaker;
 use PDL::Core::Dev;
+use Alien::proj;
 
 my $package_name = "PDL::Transform::Proj4";
 my $lib_name = "Proj4";
 
-eval { require Alien::proj };
-if ($@) {
-  write_dummy_make("Will skip build of $package_name on this system - no Alien::proj");
-  return;
-}
-
 my $ppfile = "proj4.pd";
 my $package = [$ppfile, 'Proj4', $package_name];
 my %hash = pdlpp_stdargs($package);
@@ -21,6 +16,18 @@ $hash{INC}     .= ' ' . Alien::proj->cflags;
 $hash{realclean} ||= { FILES => 'Proj4.xs' };
 $hash{realclean}{FILES} .= ' _Inline';
 $hash{PM}{'Demo.pm'} = '$(INST_LIB)/PDL/Demos/Proj4_demo.pm';
+$hash{CONFIGURE_REQUIRES} = {
+  'ExtUtils::MakeMaker' => 0,
+  'PDL' => '2.094',
+  'Alien::proj' => '1.29', # guarantee minimum PROJ 7.1 as need degree_output
+};
+$hash{PREREQ_PM} = {
+  'PDL' => '2.094',
+};
+$hash{TEST_REQUIRES} = {
+  'Test::More' => '0.88',
+};
+$hash{AUTHOR} = 'PerlDL Developers <pdl-general@lists.sourceforge.net>';
 
 undef &MY::postamble; # suppress warning
 *MY::postamble = sub { pdlpp_postamble( $package ); };

proj4.pd

@@ -9,6 +9,7 @@ use File::Spec;
 use Alien::proj;
 
 our $VERSION = "2.096";
+pp_setversion($VERSION);
 
 pp_add_isa( 'PDL::Transform' );