The problem was described and fixed here (thanks to kmx):
http://www.mail-archive.com/win32-vanilla@perl.org/msg00343.html

strawberry-portable 5.12.3 needs the following patches:

diff -ru portable.orig\perl\vendor\lib\Portable\Config.pm 
portable.new\perl\vendor\lib\Portable\Config.pm
--- portable.orig\perl\vendor\lib\Portable\Config.pm    Wed Apr 13 02:
+20:12 2011
+++ portable.new\perl\vendor\lib\Portable\Config.pm     Mon Oct 31 13:
+00:13 2011
@@ -32,7 +32,7 @@
                        and
                        length $conf->{$key}
                        and not
-                       $key =~ /^ld/
+                       $key =~ /(^ld|^libpth$)/
                ) {
                        $self->{$key} = $conf->{$key};
                        next;
@@ -42,7 +42,7 @@
                        $root, split /\//, $conf->{$key},
                ); #join path to directory of portable perl with value
+ from 
config file
        }
-       foreach my $key ( grep { /^ld/ } keys %$self ) { #linker confi
+g 
variables
+       foreach my $key ( grep { /(^ld|^libpth$)/ } keys %$self ) { #l
+inker 
config variables
                next unless defined $self->{$key};
                $self->{$key} =~ s/\$(\w+)/$self->{$1}/g;
        }
diff -ru portable.orig\portable.perl portable.new\portable.perl
--- portable.orig\portable.perl Sun Feb 06 21:19:30 2011
+++ portable.new\portable.perl  Mon Oct 31 12:59:14 2011
@@ -56,10 +56,12 @@
   installvendorman3dir: ''
   installvendorscript: 'perl/bin'
   ld: g++.exe
-  lddlflags: '-mdll -s -L"$archlib\CORE" -L"$libpth"'
-  ldflags: '-s -L"$archlib\CORE" -L"$libpth"'
-  ldflags_nolargefiles: '-s -L"$archlib\CORE" -L"$libpth"'
-  libpth: c/lib
+  lddlflags: '-mdll -s -L"$archlib\CORE" -L"$_workaround1"'
+  ldflags: '-s -L"$archlib\CORE" -L"$_workaround1"'
+  ldflags_nolargefiles: '-s -L"$archlib\CORE" -L"$_workaround1"'
+  _workaround1: c/lib
+  _workaround2: c/i686-w64-mingw32/lib
+  libpth: $_workaround1 $_workaround2
   perlpath: perl/bin/perl.exe
   prefix: perl
   prefixexp: perl
[download]

Cheers, Christoph

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