I'm trying to build Exim with PAM support. I have included -lpam in <small>EXTRALIBS</small>, but I'm still getting a linking error:

/lib/libpam.so: undefined reference to `dlerror'
/lib/libpam.so: undefined reference to `dlclose'
/lib/libpam.so: undefined reference to `dlopen'
/lib/libpam.so: undefined reference to `dlsym'

Add -ldl to <small>EXTRALIBS</small>. In some systems these dynamic loading functions are in their own library.