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**Goal: Update our build system to El Capitan**
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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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Otherwise, move on to the next lesson
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Upgrading the cross-compiler
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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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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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Then run `xcode-select --install` to update OSX commandline tools
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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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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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We will need to recompile binutils and our cross-compiled gcc. Export the targets and prefix:
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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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binutils
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--------
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Remember: always be careful before pasting walls of text from the internet. I recommend copying line by line.
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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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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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Now try to type `make` on this lesson's folder and check that everything compiles smoothly
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