"Jens Hartwig" <jens.hartwig@t-systems.de> writes:
> I am running PostgreSQL-7.0.3. I changed the value of BLCKSZ (in
> "include/config.h" to 16384, recompiled and reinstalled the sources.
> [ but it didn't take ]
Either you didn't do a full recompile (best to "make clean" then "make
all"), or you neglected to initdb, or some other procedural error.
regards, tom lane