Cross compiling Winboard in Linux

Hi,

I have tried to see if I could cross copmile Winboard in Linux in order 
to be able to see if any code changes I make will break Winboard.

It was relatively easy to do with a ready-made minGW cross compiler I 
just had to install, and the cross compiled Winboard.exe runs fine with 
Wine.

But I had to make a few changes in the sources:

1) I replaced the functions random() and srandom() with the standard C 
functions rand() and srand() in backend.c and zippy.c.

Is there any particular reason to use the non-standard versions of these 
function?

2) I replaced the include file <Windowsx.h> with <windowsx.h> in 
winboard/wsettings.c and winboard/wchat.c.

I have no idea about what the include file does. I just found one with a 
similar name to replace a non-existing file - and saw that it could 
compile with no errors. Is it safe to replace Windowsx.h with windowsx.h?

3) I changed the reference to "res\\winboard.exe.manifest" in 
winboard/winboard.rc to use "/" instead of "\"

Is there any any need to have that file in a subdirectory. It would be 
easier for me if it could be referenced without the need of path separator.

4) I replaced windres with i586-mingw32msvc-windres in the makefile and 
added --include-dir /usr/i586-mingw32msvc/include to its call arguments.

5) I removed $(PROJ).exe's dependency of $(PROJ).hlp in the makefile, as 
I cannot build the help file (I found nothing to replace "C:/Program 
Files/Help Workshop/hcrtf"). That dependency seems unnecessary to me anyway.