Path problems

[Fabrizio Bartolomucci]

Following a web suggestion, I edited file macports.conf in 
/opt/local/etc/macports to add /Developer/usr/bin in the sbin path, but 
I came to the following error.
What else must I make?

sudo ./port upgrade outdated
--->  Computing dependencies for zlib
--->  Building zlib
Error: Target org.macports.build returned: shell command " cd 
"/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_archivers_zlib/work/zlib-1.2.3" 
&& /Developer/usr/bin/make -j2 all " returned error 2
Command output: /usr/bin/gcc-4.2 -O2 -arch x86_64 -DNO_snprintf 
-DHAS_sprintf_void -DNO_ERRNO_H   -c -o example.o example.c
make: /usr/bin/gcc-4.2: Command not found