[Dovecot] dovecot does not find libpam when compiling with customized prefix

Hello everybody,

I try to compile dovecot 2.1.7 with a customized --prefix setting and --with-pam . Although I installed libpam into the same --prefix, dovecot does not find it:

checking for pam_start in -lpam... no configure: error: Can't build with PAM support: libpam not found

The same or a similar problem seems to have appeared 4 years ago: http://www.dovecot.org/list/dovecot/2008-February/028750.html

Which libpam file does dovecot expect in which directory? And possibly there is something wrong with the pam_start function?

Thanks in advance,

Roland