The problem is that bzr-builddeb does not copy the the required tarball into the build-area.
It works if the .orig-newlib.tar.gz file is manually copied before running bzr-builddeb.
The problem is that bzr-builddeb does not copy the the required tarball into the build-area.
It works if the .orig-newlib.tar.gz file is manually copied before running bzr-builddeb.