Won't build on Linux

[patrislav1]

Apparently the install.sh has to be run before build - but as described in #27 it references dead links, so the build fails.

@gilesknap made some patches to fix it, but they are not merged for some reason.

Just in case anyone else bumps into this, here's the steps to solve it:

1. retrieve the relevant files from linux-vendor branch
   git checkout linux-vendor -- install.sh vendor/Makefile
2. run install.sh
3. build the vendor dir first (the whole repo can't be built in one go for some reason)
   pushd vendor && make && popd
4. build the main tree (make)

To the maintainer: please consider merging the linux-vendor branch.