Perl MCPAN can’t write Makefile!?!?

In attempting to install SpamAssassin per Joel’s article, I’m getting some problems with the perl CPAN installs. It says it can’t write the Makefile and then fails all other steps past that. Yet it seems to write the file fine. I’m running perl with sudo and also after su’ing to root. I’ve even changed the ownership of the directories and files to root to be sure.

This is all on 10.3 Server with XCode installed.

Article:
https://www.afp548.com/Articles/mail/postfix-sa.html

Trying this command:

install Archive::Tar Archive::Zip Compress::Zlib Convert::UUlib MIME::Base64 \ 
MIME::Parser Mail::Internet Net::Server Digest::MD5 IO::Stringy Time::HiRes \ 
Unix::Syslog Digest::SHA1 Mail::SpamAssassin

or subset of the above:

install Compress::Zlib

I get:

cpan> install Compress::Zlib 
Running install for module Compress::Zlib 
Running make for P/PM/PMQS/Compress-Zlib-1.33.tar.gz 
CPAN: Digest::MD5 loaded ok 
Checksum for /Users/admin/.cpan/sources/authors/id/P/PM/PMQS/Compress-Zlib-1.33.tar.gz ok 
Scanning cache /Users/admin/.cpan/build for sizes 
Compress-Zlib-1.33/ 
Compress-Zlib-1.33/zlib-src/ 
Compress-Zlib-1.33/zlib-src/inftrees.c 
...<snip>... 
Compress-Zlib-1.33/MANIFEST 
Compress-Zlib-1.33/ANNOUNCE 
Compress-Zlib-1.33/fallback.h 
Removing previously used /Users/admin/.cpan/build/Compress-Zlib-1.33 

? CPAN.pm: Going to build P/PM/PMQS/Compress-Zlib-1.33.tar.gz 

Parsing config.in... 
Building Zlib enabled 
Looks Good. 
Up/Downgrade complete. 
Checking if your kit is complete... 
Looks good 
Writing Makefile for Compress::Zlib 
? ? -- NOT OK 
Running make test 
? Can't test without successful make 
Running make install 
? make had returned bad status, install seems impossible