[Wine] Dependencies

[c_andy_man]

When I want to install wine on a custom root directory, there are lots of dependency-warnings. Just for a test i installed it with 
Code:
rpm -Uvh --nodeps --root /wineroot

. That works until the %post script which is 
Code:
%post -p /sbin/ldconfig
%postun -p /sbin/ldconfig


the installation stops there but the path is created corectly and usable (i think). 

What does this post script do? I know -p as a parameter but not as a command.