anchor.diff:  if [%1]==[] goto usage
   if [%2]==[] goto usage
   set BuildConfiguration=%3
  -if [BuildConfiguration]==[] set BuildConfiguration=Debug
  +if "%BuildConfiguration%"=="" set BuildConfiguration=Debug
   
   set PackageVersion=%1
   set PackageRefVersion=%2
  
positive.code: @echo build-configuration is the build configuration used for packaging (default is Debug)
  
  :eof
  pause
  exit /B 1
negative.code: nuget pack ..\Adapters\Kephas.Npgsql\Package.nuspec -BasePath ..\Adapters\Kephas.Npgsql -Symbols -properties Configuration=%BuildConfiguration%;Version=%PackageVersion%;RefVersion=%PackageRefVersion%
  
  @echo Done.
  @pause
  
  @goto :eof
  :usage
  @echo Usage: %0 ^<version^> ^<ref-version^> [^<build-configuration^> = Debug]
  @echo version is the package version number
  