installing pgsql

hi, i am trying to install postgresql.  i have unzipped the 7.4.1 source files
into a folder & run ./configure.  however when i enter: gmake i get the
following error message:

src/Makefile.global:278: src/Makefile.port: No such file or directory
gmake: *** No rule to make target '`src/Makefile.port'. Stop.

does any1 know why i can't run gmake (i do have it installed version 3.79.1)?
i really want to install this damn program :)