What steps will reproduce the problem?
1. ./configure --prefix=/
2. make clean
3. ls /lib/security

What is the expected output? What do you see instead?
- makefile should only remove the files that it touches, not the whole
target directory.

What version of the product are you using? On what operating system?
- SVN r184

Please provide any additional information below.
- This was on ubuntu, so I just reinstalled the relevant pam modules, but
it could catch out the unwary!