Xcode 3 includes the GNU C and C++ compilers, but the versions are a bit dated. Download the latest precompiled GNU compilers.Xcode 3 uses a standard Mac installer, so the install should be painless. You will need to register as an Apple developer to download Xcode 3, but this is free. Xcode is Apple's software development environment, a set of tools that aim to make it easier to write Mac software. Installing the compilers is essentially a 2 step process. Instructions for Mac OS 10.6 (Snow Leopard) with Xcode 3 An Apple App Store account (for Mac OS 10.7-10.10). To install the GNU compilers as described in this HOWTO, you'll need the following: Note that you'll need to follow the instructions on this page prior to installing Open MPI if you don't already have some set of compilers installed. If you have a multi-core Mac (most should by now) and would like to run codes that use MPI to distribute processing across multiple processor cores, you should also check out the HOWTO for installing Open MPI on Mac OS X. This means that using command line utilities such as compilers is straightforward, making coding on your Mac easy. One of the nice things about Mac OS X is that you have a polished user interface atop a Unix operating system. This HOWTO will guide you through the installation of the GNU C, C++ and Fortran compilers on older versions of Mac OS X (10.6 - 10.10).
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