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+**Goal: Update our build system to El Capitan**
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+
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+If you were following this guide from the beginning, and upgraded to El Capitan only
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+to find that Makefiles don't compile anymore, follow these instructions to upgrade
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+your cross-compiler.
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+
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+Otherwise, move on to the next lesson
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+
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+Upgrading the cross-compiler
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+----------------------------
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+
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+We will follow the same instructions as in lesson 11, more or less.
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+
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+First, run `brew upgrade` and you will get your gcc upgraded to version 5.0 (at the time this guide was written)
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+
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+Then run `xcode-select --install` to update OSX commandline tools
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+
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+Once installed, find where your packaged gcc is (remember, not clang) and export it. For example:
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+
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+```
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+export CC=/usr/local/bin/gcc-5
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+export LD=/usr/local/bin/gcc-5
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+```
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+
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+We will need to recompile binutils and our cross-compiled gcc. Export the targets and prefix:
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+
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+```
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+export PREFIX="/usr/local/i386elfgcc"
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+export TARGET=i386-elf
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+export PATH="$PREFIX/bin:$PATH"
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+```
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+
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+binutils
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+--------
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+
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+Rember: always be careful before pasting walls of text from the internet. I recommend copying line by line.
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+
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+```sh
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+mkdir /tmp/src
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+cd /tmp/src
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+curl -O http://ftp.gnu.org/gnu/binutils/binutils-2.24.tar.gz # If the link 404's, look for a more recent version
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+tar xf binutils-2.24.tar.gz
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+mkdir binutils-build
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+cd binutils-build
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+../binutils-2.24/configure --target=$TARGET --enable-interwork --enable-multilib --disable-nls --disable-werror --prefix=$PREFIX 2>&1 | tee configure.log
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+make all install 2>&1 | tee make.log
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+```
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+
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+
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+gcc
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+---
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+```sh
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+cd /tmp/src
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+curl -O http://mirror.bbln.org/gcc/releases/gcc-4.9.1/gcc-4.9.1.tar.bz2
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+tar xf gcc-4.9.1.tar.bz2
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+mkdir gcc-build
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+cd gcc-build
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+../gcc-4.9.1/configure --target=$TARGET --prefix="$PREFIX" --disable-nls --disable-libssp --enable-languages=c --without-headers
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+make all-gcc
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+make all-target-libgcc
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+make install-gcc
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+make install-target-libgcc
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+```
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+
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Carlos