Hi Everybody I use R2.9.2 on Mac OS X 10.5.2. I tried to install RPostgreSQL from source on CRAN via the package installer. Apparently the program cannot find my C compiler gcc . Here is the output message trying URL ' http://cran.za.r-project.org/src/contrib/RPostgreSQL_0.1-6.tar.gz' Content type 'application/x-gzip' length 141399 bytes (138 Kb) opened URL =================================================downloaded 138 Kb * Installing *source* package ‘RPostgreSQL’ ... checking for gcc... no checking for cc... no checking for cl.exe... no configure: error: no acceptable C compiler found in $PATH See `config.log' for more details. ERROR: configuration failed for package ‘RPostgreSQL’ * Removing ‘/Library/Frameworks/R.framework/Versions/2.9/Resources/library/RPostgreSQL’ I an sure I have gcc-4.0 installed because I can type "gcc-4.0 --version" in the terminal and get i686-apple-darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5465) Copyright (C) 2005 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. How do I tell R where gcc is? regards Christiaan [[alternative HTML version deleted]]