I get the same errors as OP with latest mingw 
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=c:/mingw/bin/../libexec/gcc/mingw32/4.5.2/lto-wrap
+per.exe
Target: mingw32
Configured with: ../gcc-4.5.2/configure --enable-languages=c,c++,ada,f
+ortran,objc,obj-c++ --disable-sjlj-exceptions --with-dwarf2 --enable-
+shared --enable-libgomp --disable-win32-registry --enable-libstdcxx-d
+ebug --enable-version-specific-runtime-libs --disable-werror --build=
+mingw32 --prefix=/mingw
Thread model: win32
gcc version 4.5.2 (GCC)

[download]
And yes, I have 
C:\MinGW\include\dirent.h
C:\MinGW\share\libtool\libltdl\lt__dirent.c
C:\MinGW\share\libtool\libltdl\libltdl\lt__dirent.h

[download]

I also get a bunch of these warnings 

warning: incompatible implicit declaration of built-in function 'alloc
+a'

[download]
which seems to be related to Richard Henderson - Re: Fix implicit declaration warnings for alloca in target files 
On Thu, Sep 16, 2004 at 08:55:50AM -0400, Kaveh R. Ghazi wrote:
> +/* GCC always provides __builtin_alloca(x).  */
> +#ifndef alloca
> +#define alloca(x) __builtin_alloca(x)
> +#endif

Should be #undef, not #ifndef.

[download]

In reply to Re^5: KinoSearch Installation errors by Anonymous Monk
in thread KinoSearch Installation errors by archimca

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.