Wouldn't passing -I and -L do that? (extra paths) Editing Config.pm is out of the question. 
Summary of my perl5 (revision 5 version 6 subversion 1) configuration:
  Platform:
    osname=MSWin32, osvers=4.0, archname=MSWin32-x86-multi-thread
    uname=''
    config_args='undef'
    hint=recommended, useposix=true, d_sigaction=undef
    usethreads=undef use5005threads=undef useithreads=define usemultip
+licity=define
    useperlio=undef d_sfio=undef uselargefiles=undef usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
  Compiler:
    cc='cl', ccflags ='-nologo -O1 -MD -DNDEBUG -DWIN32 -D_CONSOLE -DN
+O_STRICT -DHAVE_DES_FCRYPT  -D
PERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DPERL_MSVCRT_READFIX',
    optimize='-O1 -MD -DNDEBUG',
    cppflags='-DWIN32'
    ccversion='', gccversion='', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=undef, longlongsize=8, d_longdbl=define, longdblsize=10
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t',
+ lseeksize=4
    alignbytes=8, usemymalloc=n, prototype=define
  Linker and Libraries:
    ld='link', ldflags ='-nologo -nodefaultlib -release  -libpath:"C:/
+Perl\lib\CORE"  -machine:x86'
    libpth="C:\Program Files\Microsoft Visual Studio\VC98\mfc\lib" "C:
+\Program Files\Microsoft Visua
l Studio\VC98\lib" "C:\Perl\lib\CORE"
    libs=  oldnames.lib kernel32.lib user32.lib gdi32.lib winspool.lib
+  comdlg32.lib advapi32.lib sh
ell32.lib ole32.lib oleaut32.lib  netapi32.lib uuid.lib wsock32.lib mp
+r.lib winmm.lib  version.lib o
dbc32.lib odbccp32.lib msvcrt.lib
    perllibs=  oldnames.lib kernel32.lib user32.lib gdi32.lib winspool
+.lib  comdlg32.lib advapi32.li
b shell32.lib ole32.lib oleaut32.lib  netapi32.lib uuid.lib wsock32.li
+b mpr.lib winmm.lib  version.l
ib odbc32.lib odbccp32.lib msvcrt.lib
    libc=msvcrt.lib, so=dll, useshrplib=yes, libperl=perl56.lib
  Dynamic Linking:
    dlsrc=dl_win32.xs, dlext=dll, d_dlsymun=undef, ccdlflags=' '
    cccdlflags=' ', lddlflags='-dll -nologo -nodefaultlib -release  -l
+ibpath:"C:/Perl\lib\CORE"  -ma
chine:x86'


Characteristics of this binary (from libperl):
  Compile-time options: MULTIPLICITY USE_ITHREADS PERL_IMPLICIT_CONTEX
+T PERL_IMPLICIT_SYS
  Locally applied patches:
        ActivePerl Build 633
  Built under MSWin32
  Compiled at Jun 17 2002 21:33:05
  @INC:
    C:/Perl/lib
    C:/Perl/site/lib
    .

C:\>

[download]
so you really need to "show" them to Makefile.PL somehow.

I'm open for suggestions (I cracked open Makefile.PL at one point, added stuff to LIBS and INC, as well as cracking the Makefile itself open and doing that under CCFLAGS, but that didn't really solve anything I didn't by hardcoding the stuff myself as described in the original thread ~ I really disliked doing that)

At this point I really am convinced (since i'm using zlib 1.1.4, cause I can't find no other) that this is mostly due to my zlib version ~ most likely the Tk::PNG stuff needs to be updated to work with the newer zlib/libpng (imgPNG.c is the heart'n'soul of the module ~ i'm not an xs hacker).

 
______crazyinsomniac_____________________________
Of all the things I've lost, I miss my mind the most.
perl -e "$q=$_;map({chr unpack qq;H*;,$_}split(q;;,q*H*));print;$q/$q;"

In reply to Re: Re: Compiling Tk::PNG on win32 (complications, more c/xs than perl) by crazyinsomniac
in thread Compiling Tk::PNG on win32 (complications, more c/xs than perl) by crazyinsomniac

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.