Gems installed from git cannot be required

[thisismydesign]

When I use gems like this:

gem 'my-gem', git: "https://github.com/x/y.git"

# ... later in the app:
requrie `my/gem`

I get a LoadError when running the executable. They do show up in the package but under: ocrXYZ.tmp\lib\ruby\gems\2.3.0\bundler\gems instead of ocrXYZ.tmp\lib\ruby\gems\2.3.0\gems (like regurarly installed gems). This is the normal behaviour of bundler.

Any help on how to get this resolved is appreciated.

As explained here I tried:

require 'rubygems'
require 'bundler/setup'

But no success.

This on the other hand:

require 'bundler'
Bundler.setup(:default)

Results in Bundler::GemfileNotFound even if the file in included in the build and is added to $LOAD_PATH.