anchor.diff:  
   
   
  -
  -
   if %install_fontconfig% == yes set install_expat=yes
   
   
  +
   if %install_libpng% == yes set install_zlib=yes
  -
  -
  -if %install_libvirt_scripts% == yes set install_gnutls=yes
  -if %install_libvirt_scripts% == yes set install_zlib=yes
  -if %install_libvirt_scripts% == yes set install_python=yes
   
   
   
  
positive.code: 
  if %install_expat% == yes call msys_setup_expat.bat
  
  if %install_zlib% == yes call msys_setup_zlib.bat
  
  if %install_libpng% == yes call msys_setup_libpng.bat
  
negative.code: 
  
  rem ===========================================================================
  rem   create install_file_silent.bat script
  rem ===========================================================================
  
  set out=%tmp%\install_file_silent.bat
  echo @echo off                                                      >  %out%
  echo rem usage: src dst                                             >> %out%
  echo copy /y %%1 %%2 ^> nul                                         >> %out%
  echo if not %%ERRORLEVEL%%==0 echo ERROR: installing %%1 failed     >> %out%
  
  
  
  
  rem ===========================================================================
  rem   download and unpack 7zip using msiexec
  rem ===========================================================================
  
  