Problem with bdb option

[thierryW <thierryw@libertysurf.fr>]

Hi everybody.
When i compile openldap 2.1.3 with this :
many flags .../configure --enable-syslog --disable-ipv6 
--with-cyrus-sasl --with-tls --with-threads --enable-aci --enable-crypt 
--enable-spasswd --enable-modules --enable-bdb 
--with-bdb-module=dynamic --enable-x-compile --with-yielding-select=manual

I get this error :

Entering subdirectory slapd
make[2]: Entering directory `/usr/src/Ldapv3/openldap-2.1.3/servers/slapd'
ar: ../back-*/*.a: No such file or directory
mv: cannot stat `*.o': No such file or directory
ar: *.o: No such file or directory
added backend library back-*/*.a

mv: cannot stat `tmp/libbackends.a': No such file or directory
make[2]: *** [libbackends.a] Error 1
make[2]: Leaving directory `/usr/src/Ldapv3/openldap-2.1.3/servers/slapd'
make[1]: *** [all-common] Error 1
make[1]: Leaving directory `/usr/src/Ldapv3/openldap-2.1.3/servers'
make: *** [all-common] Error 1

i normally use option --with-ldbm-api=berkeley and it works but i just 
want to test with-bdb dynamic modules option..
What's the difference ?

thanks for reply..
Second question, what's the meaning of option yielding ? it seems to be 
relational with threads but i'm not understand what it is..
thanks