problem with Qmailadmin and vpopmail

I compile vpopmail 4.8.7 and try it no problem. I can add and delete domains and users I download Qmailadmin 0.34 , compile it and make install-strip , no problem. The first use on the login screen , when I enter my domain name and password and login I get the message : vsql_getpw: failed select

problem compiling qmailadmin

I have install the package qmailsource for debian and compile it and vpopmail for debian compiled by Ondrej Sury .all runs fine but when I try to install qmailadmin and compile it I get : make all-recursive make[1]: Entering directory `/usr/src/qmailadmin-0.30' make[2]: Entering directory