binary_available
static int binary_available(const char *prog);
return binary_available("fsck_lfs") && binary_available("mount_lfs")
&& binary_available("newfs_lfs");
have_raid = binary_available("raidctl");
have_vnd = binary_available("vndconfig");
have_cgd = binary_available("cgdconfig");
have_lvm = binary_available("lvm");
have_gpt = binary_available("gpt");
have_dk = binary_available("dkctl");