Revert "add yum"

This reverts commit 417e411a8dfce34c78e8e0cc8ce81e162ee9c9d9.
Revert "add build-essential"

This reverts commit ad293fc6b00ae5eff3dae4525d1f887230684e57.
Revert "try something new..."

This reverts commit 688676b85088bb0278b6d5d7573ddc33f3ad4715.