Build script is a bit too tricky because of "pushd"/"popd"

[vi]

Build script uses pushd/popd a lot.

It confuses, you need to balance pushd/popd...

There is alternative:

( cd "$directory"
)

The code in in () have separate current directory.

Is it an early version of the script?

When something fails and I restart the script I see different error message... Also it clones the same git repositories multiple times...