Hi all. Well in my $SRC/authlib directory of Courier, there was no binary called authshadow/authpw. I redirected the configure output to an outfile, and I found the shadow test to have ended strangely. The relevant output is: checking shadow.h usability... yes checking shadow.h presence... yes checking for shadow.h... yes checking for getspent in -lshadow... no It seems that the tested function returned 0. Does Courier require a certain version of glibc to be installed? Is there any specific reason why the function test would fail, despite the fact that shadow.h is present?