LibreOffice build problem in Windows(cygwin)

Fatal error building Windows release (Cygwin)

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(1/1) Building module xmlreader

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Entering /home/walter/git/libo/xmlreader/prj

[ build CXX ] xmlreader/source/pad

[ build CXX ] xmlreader/source/span

[ build CXX ] xmlreader/source/xmlreader

c:/cygwin/home/walter/git/libo/xmlreader/source/xmlreader.cxx(29) : fatal error C1083: Cannot open include file: ‘sal/config.h’: No such file or directory

c:/cygwin/home/walter/git/libo/xmlreader/source/pad.cxx(29) : fatal error C1083: Cannot open include file: ‘sal/config.h’: No such file or directory

c:/cygwin/home/walter/git/libo/xmlreader/source/span.cxx(29) : fatal error C1083: Cannot open include file: ‘sal/config.h’: No such file or directory

[ build RES ] xmlreader/default

[ build RES ]

make: *** No rule to make target

‘/home/walter/git/libo/workdir/wntmsci12.pro/CxxObject/xmlreader/source/pad.o’, needed by
‘/home/walter/git/libo/workdir/wntmsci12.pro/LinkTarget/Library/ixmlreader.lib’. Stop.

make: *** Waiting for unfinished jobs…

awk: fatal: can’t open source file `C:/cygwinc:/cygwin/home/walter/git/libo/solenv/gbuild/processdeps.awk’ for
reading (No such file or directory)

make: ****

/home/walter/git/libo/workdir/wntmsci12.pro/WinResTarget/xmlreader/default.res Error 2

dmake: Error code 2, while making ‘all’

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How can you compile without any error a libreoffice3.5.4.2 on Windows(cygwin)?

Calling gawk from shell, there’s no problem.

How to solve the this problem?

Which environment is used ?

Thanks

Regards