Perl/Tk not building via CPAN on OS X Mountain Lion - perl

Question

I can not get Perl/Tk to install via CPAN on OS X Mountain Lion. It errors with an error in a file with which google does not help:
/Users/villadelfia/perl5/perlbrew/perls/perl-5.17.8/bin/perl5.17.8 /Users/villadelfia/perl5/perlbrew/perls/perl-5.17.8/lib/5.17.8/ExtUtils/xsubpp -typemap /Users/villadelfia/perl5/perlbrew/perls/perl-5.17.8/lib/5.17.8/ExtUtils/typemap -typemap /Users/villadelfia/Downloads/Tk-804.030/Tk/typemap IO.xs > IO.xsc && mv IO.xsc IO.c
Warning: Found a 'CODE' section which seems to be using 'RETVAL' but no 'OUTPUT' section. in IO.xs, line 235
cc -c -I.. -I/usr/X11R6/include -I/usr/local/include/freetype2 -fno-common -DPERL_DARWIN -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -O3 -DVERSION=\"804.03\" -DXS_VERSION=\"804.03\" "-I/Users/villadelfia/perl5/perlbrew/perls/perl-5.17.8/lib/5.17.8/darwin-2level/CORE" -Wall -Wno-implicit-int -Wno-comment -Wno-unused -D__USE_FIXED_PROTOTYPES__ IO.c
IO.xs:210:10: error: invalid argument type 'void' to unary expression
if (!SvUPGRADE(buf, SVt_PV))
^~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
make[1]: *** [IO.o] Error 1
make: *** [subdirs] Error 2
As you can see, I run perlbrew as well.
Any ideas what could cause this?

Answer 1

From the 5.17.7 release notes:
SvUPGRADE() is no longer an expression. Originally this macro (and its
underlying function, sv_upgrade()) were documented as boolean, although
in reality they always croaked on error and never returned false. In 2005
the documentation was updated to specify a void return value, but
SvUPGRADE() was left always returning 1 for backwards compatibility. This
has now been removed, and SvUPGRADE() is now a statement with no return
value.
So this is now a syntax error:
if (!SvUPGRADE(sv)) { croak(...); }
If you have code like that, simply replace it with
SvUPGRADE(sv);
or to to avoid compiler warnings with older perls, possibly
(void)SvUPGRADE(sv);
It has already been reported.