Access b.install_path after v0.17

Hi, Previous to v0.17, I accessed zig-out (or the installed dir) using b.install_path. This was useful because it let me create steps based on the produced files. Example where I used to add a flag to a Qemu command. b.fmt("file=fat:rw:{s}/{s},format=raw", .{ b.install_path, IMG_DIR_NAME }), What’s now the best approach to do this? Thanks in advance