Cross-compiling 64bit library sha256 for Windows 7 64bit with critcl

I hit a snag when trying to compile on a Linux (32bit) host a Windows 
64bit library version of sha256 from tcllib with critcl:

I have downloaded from the ming64 download site the version for a Linux 
host, set the PATH for critcl:

export PATH=/home/dia/mingw64/x86_64-w64-mingw32/bin/:$PATH

and started compiling:

$ tclkit critcl.kit -lib sha256c.tcl
Cross compiling for Windows using Xmingwin
Source: sha256c.tcl

Fri Jul 01 09:51:42 +0200 2011 - /home/dia/Projekte/gorilla/sha256c.tcl
gcc -r -nostdlib -DUSE_TCL_STUBS -I/home/dia/.critcl/Windows-x86 
-DTCL_BYTE_ORDER=1234 -o 
/home/dia/.critcl/Windows-x86/v035_7bf64913e94cd555e881b5a952aaab81_pic.o /home/dia/.critcl/Windows-x86/v035_7bf64913e94cd555e881b5a952aaab81.c 
/home/dia/Projekte/gorilla/sha256.c

In file included from 
/home/dia/.critcl/Windows-x86/v035_7bf64913e94cd555e881b5a952aaab81.c:5:0:
/home/dia/.critcl/Windows-x86/tcl.h:162:22: fatal error: stdio.h: Datei 
oder Verzeichnis nicht gefunden
compilation terminated.
/home/dia/Projekte/gorilla/sha256.c:52:20: fatal error: string.h: Datei 
oder Verzeichnis nicht gefunden
compilation terminated.
ERROR while compiling code in /home/dia/Projekte/gorilla/sha256c.tcl:

Error: Did not find: stdio.h and string.h

When doing the job for a 32bit Win library with the 32bit development 
environment of xmingw there is no problem at all.

So I don't understand what causes the problems. My stdio.h and string.h 
are in the default Linux path /usr/include ... A workaround would be to 
create some symlinks but I would like to know why critcl doesn't find 
the system libraries. Do I have to set some GCC environment variables or 
TCL variables?

Has anyone tried to compile a 64bit library for Win64?

By the way:

As for Linux my application is downloaded 100 times for 64bit and for 
32bit 114 times. I suppose for Windows it is the same meanwhile.



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