Inline::Perl5 warning

[cjfields@cjfields-imac zef (master)]$ zef install Inline::Perl5
===> Searching for: Inline::Perl5
===> Building: Inline::Perl5:ver('0.22'):auth('github:niner')
In file included from p5helper.c:2:
In file included from /Users/cjfields/perl5/perlbrew/perls/perl-5.20.1t/lib/5.20.1/darwin-thread-multi-2level/CORE/perl.h:5188:
/Users/cjfields/perl5/perlbrew/perls/perl-5.20.1t/lib/5.20.1/darwin-thread-multi-2level/CORE/inline.h:311:9: warning: nonnull parameter 'pv' will evaluate to 'true' on first encounter [-Wpointer-bool-conversion]
    if (pv && len > 1) {
        ^~ ~~
1 warning generated.
===> Building [OK] for Inline::Perl5:ver('0.22'):auth('github:niner')
===> Testing: Inline::Perl5:ver('0.22'):auth('github:niner')
t/argv.t ...................... ok
t/autoload.t .................. ok
t/call.t ...................... ok
t/call_back.t ................. ok
t/call_hash.t ................. ok
t/call_p6_function_from_p5.t .. ok
t/callables.t ................. ok
t/can.t ....................... ok
t/eval.t ...................... ok
t/eval_p6_in_p5.t ............. ok
t/eval_return_values.t ........ ok
t/exceptions.t ................ ok
t/file_handles.t .............. ok
t/from.t ...................... ok
t/globals.t ................... ok
t/import.t .................... ok
t/inherit.t ................... ok
t/invoke.t .................... ok
t/invoke_p6_method_from_p5.t .. ok
t/modify_array.t .............. ok
t/modify_hash.t ............... ok
t/overload.t .................. ok
t/p5_to_p6.t .................. ok
t/p6_object_destructor.t ...... ok
t/p6_to_p5.t .................. ok
t/perl5package.t .............. ok
t/perl5parent.t ............... ok
t/shadow.t .................... ok
t/stringify.t ................. ok
t/use.t ....................... ok
t/use_nested.t ................ ok
t/v6.t ........................ ok
All tests successful.
Files=32, Tests=420,  17 wallclock secs
Result: PASS
===> Testing [OK] for Inline::Perl5:ver('0.22'):auth('github:niner')
===> Installing: Inline::Perl5:ver('0.22'):auth('github:niner')