Compiling s3backer on MacOS, 2025 edition

s3backer allows you mount a single large file split into smaller chunks on S3 as a local file, via FUSE. In contrast, s3fs-fuse mounts S3 objects as individual files. s3backer is useful for hosting disk images formatted with a native filesystem. Although Apple subsequently introduced the Sparse Bundle image format, which also internally splits the image into multiple files, some reported that…