upgrade posgresql

 I have a postgresql release 6.3.2 and i get postgresql-v6.4 and i would
 like to upgrade it but when I try like that:

 #pwd
 /home/users/postgresql/postgresql-v6.4/src
 #./configure --with-tcl --with-perl --with-odbc --enable-hba
 configure:error:installation or configuration problem:C++ compiler cannot
create executables


 #./config.guess
 i586-pc-linux-gnu

 What can i do ??
 I thanks you.

 Bertrand Sauvageot