Having a Linux 2.0.30 running Samba 1.9.18p10 with quotas active and running, I installed Samba 2.0.3 using the Configure script. It failed to detect quotas and compiled Samba without quota support. A quick look at the Makefile and edit from QUOTAOBJS=noquotas.o to QUOTAOBJS=quotas.o And rerun make rebuilt smbd. Copy into /usr/local/samba/bin and restart all daemons and quota support works!