I tested this with yakyak master and it worked for me. Thanks again @HomerSp! For those who are interested, here's what I did:

git clone https://github.com/yakyak/yakyak.git
cd yakyak
perl -i~ -ple '/hangupsjs/ and $_ = qq|    "hangupsjs": "$ENV{PWD}/hangupsjs/",|' package.json
git clone https://github.com/HomerSp/hangupsjs.git
cd hangupsjs
git checkout work
cd ..
npm install
npm run gulp
npm run electron app

Confirmed working on yakyak master on macOS Sierra 10.12.6 with similar steps, minus the Perl 😛

git clone https://github.com/yakyak/yakyak.git
cd yakyak
vim package.json
# Update hangupsjs version to: "git://github.com/HomerSp/hangupsjs.git#work"
npm install
npm run gulp
npm run electron app

Edit: Interestingly though, it seems that the generated YakYak.app fails to find hangupsjs module on launch...

Confirming working using v1.5.3-beta-rolling on Mac OS X 10.11.6 El Capitan. I downloaded and installed the binary, then in Terminal did:

cd /Applications/YakYak.app/Contents/Resources/app/node_modules/hangupsjs
wget https://patch-diff.githubusercontent.com/raw/yakyak/hangupsjs/pull/107.patch
patch -p1 < 107.patch
rm -rf lib/*
npm i

Arriba!

I'm using hangupsjs for a custom bot, I rebased this PR, and I can confirm this works also for me.