Ion depends on several submodules, you will need to run
git submodule init
git submodule update
to download and sync them.
Ion requires python (2.7+) to build. It also requires gyp, which you can find
in the third_party/gyp directory, or install yourself using your a package
system. Depending on how you want to build Ion, you may need to install a
compiler (such as Xcode, clang, or gcc) and edit .gypi files in dev/ to enable
the toolchain. Generally, this requires modifying the dev/<platform>.gypi file
to point to the right paths. For Android this is dev/android_common.gypi. By
default on Linux, Ion builds using clang and libc++ (but requires libc++ and
libc++abi development libraries and headers).
On Ubuntu 14.04 LTS, you will need to install the following packages:
libc++-dev
libc++abi-dev
clang
This will use clang 3.4, which is recent enough for Ion. If you want to use a different version, remember to correctly set the CXX environment variable.
Build Ion and its dependencies by running build.sh or build.py from the
ion/ directory. Note you will have to obtain ninja binaries from
https://github.com/ninja-build/ninja/releases and place them in a
third_party/ninja/files/bin subdirectory.
If building for android, edit ion/dev/android_common.gypi and add the paths to
your Android NDK and SDK installations. Also edit dev/ant.gypi and set the
path to Apache Ant (available from https://ant.apache.org/bindownload.cgi ).