Compile under OSX Lion about rpostgresql HOT 2 CLOSED

That is a bad interaction between OS X and R, nothing more.  

When R is built, it encodes the values of a (large) number of Make variables. 
CC is among them.  For the R binary you have, this is gcc-4.2. 

Now, your system no longer has /usr/bin/gcc-4.2, but just /usr/bin/gcc.  The 
answer hence is to create the link manually --- and it is _not something we can 
do_ as part of the build process.  The package is built from within R, and 
these values are given.

Thanks a bunch! "ln -s gcc gcc-4.2" solved the problem.

Best
Nils