Why does imap not work as dl???

Hi, I am trying to compile the imap-module as a dl, but if I want to start apache I get this error: PHP Warning: Unable to load dynamic library '/usr/local/lib/php/20001222/imap.so' - /usr/local/lib/php/20001222/imap.so: undefined symbol: mxdriver in Unknown on line 0 config looks like this: ./configure --with-apxs \ --with-mysql=/usr \ --with-config-file-path=/etc \ --with-regex=system \ --with-zlib=shared \ --with-gd=shared \ --with-imap \ --with-openssl \ --with-kerberos \ --with-curl=shared \ --with-ldap=shared \ --with-swf=shared,/usr/local/swf \ --with-mnogosearch=shared \ --with-gettext=shared \ --with-db2 \ --with-db3 \ --enable-ftp=shared \ --enable-trans-sid \ --enable-calendar \ --enable-shared \ --disable-pear \ Also I do not understand, why libphp4.so gets about two megs bigger, if I compile with imap... that´s why I want to have it as dl. Can anybody give a hint? Are there any issues with imap? THANKS for your attention!