Undeclared dependency Alien::libudev

[eserte]

The build fails if Alien::libudev is not available:

Output from '/opt/perl-5.27.10t/bin/perl5.27.10 Makefile.PL':

Alien::Build::Plugin::PkgConfig::Negotiate> Using PkgConfig plugin: PkgConfig::CommandLine
Can't locate Alien/libudev.pm in @INC (you may need to install the Alien::libudev module) (@INC contains: /var/tmp/cpansmoker-1023/2018032506/CPAN-Reporter-lib-wtUE /home/cpansand/.cpan/build/2018032506/Alien-Build-1.39-0/blib/arch /home/cpansand/.cpan/build/2018032506/Alien-Build-1.39-0/blib/lib /home/cpansand/.cpan/build/2018032506/File-chdir-0.1010-0/blib/arch /home/cpansand/.cpan/build/2018032506/File-chdir-0.1010-0/blib/lib /home/cpansand/.cpan/build/2018032506/FFI-CheckLib-0.18-0/blib/arch /home/cpansand/.cpan/build/2018032506/FFI-CheckLib-0.18-0/blib/lib /opt/perl-5.27.10t/lib/site_perl/5.27.10/x86_64-linux-thread-multi /opt/perl-5.27.10t/lib/site_perl/5.27.10 /opt/perl-5.27.10t/lib/5.27.10/x86_64-linux-thread-multi /opt/perl-5.27.10t/lib/5.27.10 .) at (eval 82) line 1.
BEGIN failed--compilation aborted at (eval 82) line 1.

Probably this should be specified as configure_requires, so CPAN.pm et al may automatically install the missing dependency before running the build file.

[eserte]

Well, the change makes Alien::libudev only a runtime/build requirement, so it still fails with 0.3:

Output from '/opt/perl-5.28.0/bin/perl Makefile.PL':

Alien::Build::Plugin::PkgConfig::Negotiate> Using PkgConfig plugin: PkgConfig::CommandLine
Can't locate Alien/libudev.pm in @INC (you may need to install the Alien::libudev module) (@INC contains: /var/tmp/cpansmoker-1023/2018111708/CPAN-Reporter-lib-J_SC /opt/perl-5.28.0/lib/site_perl/5.28.0/x86_64-linux /opt/perl-5.28.0/lib/site_perl/5.28.0 /opt/perl-5.28.0/lib/5.28.0/x86_64-linux /opt/perl-5.28.0/lib/5.28.0 .) at (eval 78) line 1.
BEGIN failed--compilation aborted at (eval 78) line 1.