Using Perlbrew after macOS Mojave 10.14 update

I would like to share a minor fixup when using Perl with Perlbrew on MacOS.

After updating to MacOS X Mojave... I was not able to compile any XS module.. or even reinstall a different version of Perl itself...

Here one example output when trying to compile Clone for example

> make
Skip blib/lib/ (unchanged)
Running Mkbootstrap for Clone ()
chmod 644 ""
"/usr/local/perl/perls/perl-5.26.1/bin/perl" -MExtUtils::Command::MM -e 'cp_nonempty' -- blib/arch/auto/Clone/ 644
"/usr/local/perl/perls/perl-5.26.1/bin/perl" "/usr/local/perl/perls/perl-5.26.1/lib/5.26.1/ExtUtils/xsubpp"  -typemap '/usr/local/perl/perls/perl-5.26.1/lib/5.26.1/ExtUtils/typemap'  Clone.xs > Clone.xsc
mv Clone.xsc Clone.c
cc -c   -fno-common -DPERL_DARWIN -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -O3   -DVERSION=\"0.39\" -DXS_VERSION=\"0.39\"  "-I/usr/local/perl/perls/perl-5.26.1/lib/5.26.1/darwin-2level/CORE"   Clone.c
rm -f blib/arch/auto/Clone/Clone.bundle
env MACOSX_DEPLOYMENT_TARGET=10.3 cc  -bundle -undefined dynamic_lookup -L/usr/local/lib -fstack-protector-strong  Clone.o  -o blib/arch/auto/Clone/Clone.bundle  \

ld: library not found for -lgcc_s.10.4
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [blib/arch/auto/Clone/Clone.bundle] Error 1

This was coming from the setting of the LD variable in the Makefile...


which is advertised by Perl itself... which mean I had to recompile/reinstall all Perl versions on my system.

> perl -V | grep ld=
    ld='env MACOSX_DEPLOYMENT_TARGET=10.3 cc'

When using Perlbrew some configuration tweak are applied by Devel::PatchPerl (a Perlbrew companion...) the version used by Perlbrew on my system was *really* outdated, and this took me some time to realize this was the source of my issues...

In order to fix it I had to update install-patchperl using perlbrew command line and force to override. (I was under the incorrect assumption that 'perlbrew self-upgrade' would take care of this for me :-)

To Fix it, just update install-patchperl

> perlbrew install-patchperl

/usr/local/perl/bin/patchperl already exists, are you sure to override ? [y/N] [N] y

patchperl is installed to


It does not hurt to the same with cpanm: "perlbrew install-cpanm"

Alternatively I coud have also compiled Perl without using Devel::PatchPerl

> perlbrew install --no-patchperl perl-5.26.2

or by forcing to use ccache

> perlbrew install -Dcc="ccache gcc" perl-5.26.2

Do not forget to recompile/reinstall Perl after updating patchperl, and remove any existing Perl version.

You should consider reinstalling older Perl versions if you need them.

> perlbrew install perl-5.26.2

Hope this would help some others experiencing a similar issue...


Thanks Nico for taking the time and posting this!!!

I am sure this will save a lot of folks a lot of time, definitely will for me ;)

I got bit by this, too. It's not Mojave, per se, but XCode 10, in which libgcc has been removed.

I'll have to look at this more closely when I get home to apply the fixes.

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