def profile(base):
    # The base profile supplies defaults for every other profile, so it has no
    # parent of its own (``base`` is None here). It deliberately omits the
    # target-identifying core fields (arch/triple/libc); concrete profiles must
    # provide those.
    return Profile(
        container_image="localhost/orchid-builder:latest",
        options={
            # Install layout (where files land in the target system).
            "prefix": "/usr",
            "bindir": "/usr/bin",
            "sbindir": "/usr/bin",
            "libdir": "/usr/lib",
            "libexecdir": "/usr/libexec",
            "includedir": "/usr/include",
            "sysconfdir": "/etc",
            "localstatedir": "/var",
            # Flags for tools built to run on the build machine (host).
            "host_cflags": "-O2 -pipe",
            "host_cxxflags": "-O2 -pipe",
            "host_ldflags": "-Wl,-O1 -Wl,--sort-common -Wl,--as-needed",
        },
    )