Edit: hang on I got it totally wrong. The error message says that your library is version 11 which more-or-less matches your OS. And it is linked with something which is 10.13. The only thing is lib/Config/Augeas.o Perhaps bumping up -mmacosx-version-min=10.13?

Edit2: How to do this? make CFLAGS="-mmacosx-version-min=11.0" LDFLAGS="-mmacosx-version-min=11.0" and if that creates contradictory options then cpanm My::Module --configure-args='CFLAGS="-mmacosx-version-min=11.0" LDFLAGS="-mmacosx-version-min=11.0"' And if all else fails, edit Makefile and bump up the version from 10.13 to 11.0 manually and be careful not to re-run Makefile.PL which will re-create Makefile.

bw, bliako

Thanks. I installed augeas with homebrew. So basically you are saying I can use homebrew but that I should compile it locally instead of installing the binary with the package manager? Have I got that right?

$PM = "Perl Monk's";
$MCF = "Most Clueless Friar Abbot Bishop Pontiff Deacon Curate Priest Vicar";
$nysus = $PM . ' ' . $MCF;
Click here if you love Perl Monks

hang on I got it totally wrong. See update,sorry

Thanks, but I'm not having any success.

make CFLAGS... didn't work as this module uses Module::Build. I tried .Build CFLAGS... instead but that didn't work.

cpanm Config::Augeas --configure... did not seem to have any effect. I got the same error as the original one.

Fro your 3rd suggestion, there is no Makefile to edit and I could not find any 10.13 version number with grep anywhere in the distribution.

$PM = "Perl Monk's";
$MCF = "Most Clueless Friar Abbot Bishop Pontiff Deacon Curate Priest Vicar";
$nysus = $PM . ' ' . $MCF;
Click here if you love Perl Monks

Wild guess: if you built your perl with perlbrew before upgrading the OS that (or some of the config baked therein) may be the source of the older version. Try reinstalling your perl (although if that's the problem you may need to recompile all the XS modules as well to ensure they match the new binary).

The cake is a lie.
The cake is a lie.
The cake is a lie.

You can influence CFLAGS and LDFLAGS via the Module::Build constructor. It is documented here http://perl.mines-albi.fr/perl5.6.1/site_perl/5.6.1/Module/Build.html (but not in CPAN, wrong oops: it's here: https://metacpan.org/pod/distribution/Module-Build/lib/Module/Build/API.pod)

 my build = Module::Build->new(
     extra_compiler_flags => '... -mmacosx-version-min=11.0',
     extra_linker_flags   => '... -mmacosx-version-min=11.0',
 );
[download]

The problem is that Augeas' Build file has already some flags specified there. So, you could try to modify them with something like this (untested, just a rough sketch):

my $extra_cflags = $aug_cflags . ' ' . $libxml2_cflags . ' -Wall -Wfor
+mat -Werror=format-security';
my $extra_ldflags = $aug_libs . ' ' . $libxml2_cflags;
$extra_cflags =~ s/mmacosx-version-min=10\.13/mmacosx-version-min=11.0
+/g;
$extra_ldflags =~ s/mmacosx-version-min=10\.13/mmacosx-version-min=11.
+0/g;
print "Modified to $extra_cflags\n" ;
print "Modified to $extra_ldflags\n" ;


# insert the above before this:
print "Using $aug_libs and $aug_cflags to compile (Augeas version $aug
+_version)\n" ;
print "Using $libxml2_libs and $libxml2_cflags to compile (Augeas vers
+ion $aug_version)\n" ;
[download]

And then in the constructor

my $build = Module::Build->new
  (
 ...
  extra_compiler_flags => $extra_cflags,
   extra_linker_flags   => $extra_ldflags,
 ...
);
[download]

BTW, the option dynamic_config => 0 will create an intermediate file Build.PL which can be modified as per my 3rd suggestion. Currently for Augeas this is set to 1

Fletch's suggestion is also worth checking, perhaps with this:

perl -MConfig -e 'print $_.": ".$Config{$_}."\n" for keys %Config;'
[download]

bw, bliako