Always try a mirror. Try this one:
ftp://download.sourceforge.net/pub/mirrors/postgresql/
Build and enjoy. Interesting switchs for configure are:
--with-prefix=/dir/to/install/to
--with-odbc #build odbc interface. handy
--with-tcl # build tcl interface
--with-perl # build perl interface
--with-maxbackends=N #the default of 32 is too small! Numbers from 64 to 1024 seem good.
--enable-locale
--enable-multibyte