I guess I cannot ignore those error after all. From what I researched, the preprocessor is tripping over indented conditional if/ifndef/etc directives

Yes, my take on the stackoverflow post that I linked to earlier is that /usr/bin/cpp is doing the preprocessing, not gcc -E

I have no idea how to encourage Perl Makefile.PL to use gcc instead (which I do have installed)

Two ways that I know of:
1) for a manual build, perl Makefile.PL CC=gcc
2) with cpanm, cpanm WWW::Curl --configure-args="CC=gcc"
I haven't actually used the second method to pass CC=gcc to the build process, but I have used that to successfully pass other arguments.

However, I think you might strike issues with using gcc here, unless perl itself is built using gcc.

Can't find 'boot_WWW__Curl' symbol in /usr/lib/libCurl.dylib

This error is coming from perl. Doing a perlmonks supersearch for boot_ will throw up lots of posts, some of which should provide the solution (or at least an explanation).
Yell out if you need more help with any of that - though you seem to be making pretty good progress, anyway.

Cheers,
Rob

In reply to Re^6: installing WWW::Curl::Easy perl module in OS X 10.12.6 by syphilis
in thread installing WWW::Curl::Easy perl module in OS X 10.12.6 by igods

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.