Create Package for C++Builder

You need to select New/C++Builder Project/Package

Add unit "WPPDFREG.pas"

Add the packages under "required":

"C:\Borland\XE2\lib\win32\release\vcl.bpi" "C:\Borland\XE2\lib\win32\release\vclx.bpi"

In case of XE2 also

C:\Borland\XE2\lib\win32\release\vclimg.bpi

Now it should be possible to compile and install the package.