Error while building LO on Windows

Hello,

I am trying to build Libre Office on Windows, as described in 
http://wiki.documentfoundation.org/Development/BuildingOnWindowsWithCygwinAndMSVCExpress. 
During "instsetoo_native" I get the error:

: ######################################################
: Packaging process
: ######################################################
: Performance Info: Execute packaging start    Mon Oct  1 15:28:24 2012 
(02:21 min.)
: chdir: 
E:/LibreOfficeBuild/libreoffice-lhm/core/instsetoo_native/wntmsci12.pro/LibreOffice/native/logging/en-US_de/
: chdir: /tmp/ooopackaging/i_2001349097963/wntmsci12.pro
: Systemcall: makecab.exe /V3 /F 
E:/LibreOfficeBuild/libreoffice-lhm/core/instsetoo_native/wntmsci12.pro/LibreOffice/native/ddf/en-US_de/libreoffice1.ddf 
2>&1 |
: makecab_error (Try 1): makecab.exe /V3 /F 
E:/LibreOfficeBuild/libreoffice-lhm/core/instsetoo_native/wntmsci12.pro/LibreOffice/native/ddf/en-US_de/libreoffice1.ddf 
2>&1 |
:  !makecab_error: Missing % after variable name: %2Fpresenter.xhp
: makecab_error: Missing % after variable name: %2Fpresenter.xhp
: makecab_error: Missing % after variable name: %2Fpresenter.xhp
: makecab_error: Missing % after variable name: %2Fpresenter.xhp


I suppose this is because the ddf-file libreoffice1.ddf contains the lines:

"LibreOffice\native\zip\en-US_de\00\presenter-screen_oxt\help\en-US\caption\com.sun.PresenterScreen-windows_x86%2Fpresenter.xhp" 
com2.sun.PresenterScreen_windows_x86%2Fpresenter.xhp
"LibreOffice\native\zip\en-US_de\00\presenter-screen_oxt\help\en-US\content\com.sun.PresenterScreen-windows_x86%2Fpresenter.xhp" 
com3.sun.PresenterScreen_windows_x86%2Fpresenter.xhp

But only for that file, presenter.xhp. All other entries are without 
"%2F", for example:


"LibreOffice\native\zip\en-US_de\00\presenter-screen_oxt\help\en-US\help.db_" 
help1.db_
"LibreOffice\native\zip\en-US_de\00\presenter-screen_oxt\help\en-US\help.ht_" 
help1.ht_

Any hints, what's wrong?

Many thanks,
Ulrich