A simple test script tells me that my $ENV{'INCLUDE'} environment variable is full of directories, which aren't being passed to the compiler via Perl or CPAN... ...I think I need to rewrite my script to build an @include from $ENV{'INCLUDE'}, but this is why I needed meditate on it :)

use strict;
use warnings;

my @include = @INC;

print '@INC =('.(join ",", @include).")\n\n";
print '%INCLUDE%=('.$ENV{'INCLUDE'}.")\n";
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Gives the following output:

I:\Documents\Perl\U3 Perl Config scripts>perl testenv.pl
@INC =(I:/strawberry/perl/lib,I:/strawberry/perl/site/lib,.)

%INCLUDE%=(I:\System\GTK\INCLUDE;I:\System\GTK\INCLUDE\GTK-2.0;I:\Syst
+em\GTK\INC
LUDE\GLIB-2.0;I:\System\GTK\INCLUDE\PANGO-1.0;I:\System\GTK\INCLUDE\CA
+IRO;I:\Sys
tem\GTK\INCLUDE\ATK-1.0;I:\System\GTK\INCLUDE\GTKGLEXT-1.0;I:\System\G
+TK\LIB\GTK
-2.0\INCLUDE;I:\System\GTK\LIB\GLIB-2.0\INCLUDE;I:\System\GTK\LIB\GTKG
+LEXT-1.0\I
NCLUDE;I:\System\GTK\INCLUDE\LIBGLADE-2.0;I:\System\GTK\INCLUDE\LIBXML
+2;I:\straw
berry\c\include;I:\strawberry\perl\lib\CORE;\usr\include;C:\System\GTK
+\INCLUDE;C
:\System\GTK\INCLUDE\GTK-2.0;C:\System\GTK\INCLUDE\GLIB-2.0;C:\System\
+GTK\INCLUD
E\PANGO-1.0;C:\System\GTK\INCLUDE\CAIRO;C:\System\GTK\INCLUDE\ATK-1.0;
+C:\System\
GTK\INCLUDE\GTKGLEXT-1.0;C:\System\GTK\LIB\GTK-2.0\INCLUDE;C:\System\G
+TK\LIB\GLI
B-2.0\INCLUDE;C:\System\GTK\LIB\GTKGLEXT-1.0\INCLUDE;C:\System\GTK\INC
+LUDE\LIBGL
ADE-2.0;C:\System\GTK\INCLUDE\LIBXML2;c:\system\usr\include)
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I'm not entirely sure what this is telling me about the relationship of @INC and $ENV{'INCLUDE'}. One seems to be where Perl looks for Perly libraries... which may be set wrong, and the other is as I expect it to be configured and should point the compiler to all the appropriate include directories.

Note: The I:\ prefixed paths have beens set up by my command prompt script, while the C:\ based paths are from my computer's original environment variables.