Compile problem under windows

[Saro Engels]

Hello list!

I am currently trying to compile libidn with mingw/msys under windows 
and I get an error right at the start of making:

C:/msys/bin/sh.exe ../libtool --tag=CC   --mode=compile gcc 
-DHAVE_CONFIG_H -I. -I..     -g -O2 -MT getopt.lo -MD -MP -MF 
.deps/getopt.Tpo -c -o getopt.lo getopt.c
 gcc -DHAVE_CONFIG_H -I. -I.. -g -O2 -MT getopt.lo -MD -MP -MF 
.deps/getopt.Tpo -c getopt.c  -DDLL_EXPORT -DPIC -o .libs/getopt.o
In file included from getopt.h:38,
                 from getopt.c:27:
./unistd.h:23:13: stdout: No such file or directory

So I have to questions:
(1) Is it possible at least to build libidn with mingw or do I have to 
use cygwin?
(2) If (1) should be possible, can you help me find a solution how to 
build libidn correctly?

Thanks in advance,
SE