Interesting...
I had Wx installed via apt-get, at least I thought so, as I remembered it to fail via cpan. Then running "sudo cpan -i Wx" again, ran through and compiled fine.
Doing "cpan -i Wx::TreeListCtrl" then, succeeded as well: 
Writing 'cpp/ovl_const.h'.
Writing 'cpp/ovl_const.cpp'.
Checking if your kit is complete...
Looks good
'WX' is not a known MakeMaker parameter name.
Unrecognized argument in LIBS ignored: '-Wl,-Bsymbolic-functions'
Unrecognized argument in LIBS ignored: '-Wl,-z,relro'
Writing Makefile for Wx::TreeListCtrl
Writing MYMETA.yml and MYMETA.json
cp lib/Wx/TreeListCtrl.pm blib/lib/Wx/TreeListCtr
...

[download]
So, as it seems, the system simply was lacking Wx....

*facepalm*

In reply to Re: Problem installing Wx::TreeListCtrl by isync
in thread Problem installing Wx::TreeListCtrl (solved!) by isync

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.