Improve compatibility with gcc-4.2.1
Although this commit is more than a year old, I have just figured out that I have an issue with it. This requires functionality introduced in Boost version 1.60.0. The default Ubuntu 14.04 distribution only comes with Boost version 1.54.0.
This requirement is not mentioned anywhere. I know that people should use the conda installation, but this commit disallows to use pip on Ubuntu 14.04.