[gimp-perl] make Makefile.PL survive non-conf deps so can say what deps are

[Ed J <edj src gnome org>]

commit f9f5677f55cee76a71143daa061b7055a50508b7
Author: Ed J <mohawk2 users noreply github com>
Date:   Thu Apr 11 20:24:24 2019 +0100

    make Makefile.PL survive non-conf deps so can say what deps are

 Changes     |  3 +++
 Makefile.PL | 19 +++++++++++--------
 2 files changed, 14 insertions(+), 8 deletions(-)
---
diff --git a/Changes b/Changes
index 1c53bc1..13912a8 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,8 @@
 Revision history for Perl module Gimp
 
+2.33
+ - Makefile.PL survive non-conf deps so can say what deps are
+
 2.32 2016-05-08
 
     [API]
diff --git a/Makefile.PL b/Makefile.PL
index f3bd136..fadfb0e 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -23,15 +23,18 @@ setver:
 EOF
 }
 
-my @ext_deps = qw(Alien::Gimp Gtk2 PDL);
-my $pkg = ExtUtils::Depends->new('Gimp', @ext_deps);
 my $IDIR = 'lib/Gimp/Install';
 my $IFILES = "$IDIR/Files.pm";
-mkdir $IDIR unless -d $IDIR;
-$pkg->save_config($IFILES);
-# reinit so no PM which breaks XSMULTI
-$pkg = ExtUtils::Depends->new('Gimp', @ext_deps);
-$pkg->set_inc(q{-Ddatadir='""'});
+my $pkg = eval {
+  my @ext_deps = qw(Alien::Gimp Gtk2 PDL);
+  my $pkg = ExtUtils::Depends->new('Gimp', @ext_deps);
+  mkdir $IDIR unless -d $IDIR;
+  $pkg->save_config($IFILES);
+  # reinit so no PM which breaks XSMULTI
+  $pkg = ExtUtils::Depends->new('Gimp', @ext_deps);
+  $pkg->set_inc(q{-Ddatadir='""'});
+  $pkg;
+};
 
 my $runtime_reqs = {
   'Gtk2'               => 1.0,
@@ -77,5 +80,5 @@ WriteMakefile(
   DIR  => [ qw/examples/ ], # exclude po
   EXE_FILES => [ map { "utils/$_" } qw(gimpdoc xcftopnm embedxpm scm2perl) ],
   clean        => { FILES => $IFILES },
-  $pkg->get_makefile_vars,
+  ($pkg ? $pkg->get_makefile_vars : ()),
 );