2021-03-23 18:22:15 +01:00
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# FUSE {#sec-fuse}
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Some packages rely on
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[FUSE](https://www.kernel.org/doc/html/latest/filesystems/fuse.html) to provide
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support for additional filesystems not supported by the kernel.
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In general, FUSE software are primarily developed for Linux but many of them can
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also run on macOS. Nixpkgs supports FUSE packages on macOS, but it requires
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[macFUSE](https://osxfuse.github.io) to be installed outside of Nix. macFUSE
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currently isn't packaged in Nixpkgs mainly because it includes a kernel
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extension, which isn't supported by Nix outside of NixOS.
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If a package fails to run on macOS with an error message similar to the
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following, it's a likely sign that you need to have macFUSE installed.
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dyld: Library not loaded: /usr/local/lib/libfuse.2.dylib
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Referenced from: /nix/store/w8bi72bssv0bnxhwfw3xr1mvn7myf37x-sshfs-fuse-2.10/bin/sshfs
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Reason: image not found
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[1] 92299 abort /nix/store/w8bi72bssv0bnxhwfw3xr1mvn7myf37x-sshfs-fuse-2.10/bin/sshfs
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2021-04-01 15:45:16 +02:00
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Package maintainers may often encounter the following error when building FUSE
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packages on macOS:
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checking for fuse.h... no
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configure: error: No fuse.h found.
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This happens on autoconf based projects that uses `AC_CHECK_HEADERS` or
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`AC_CHECK_LIBS` to detect libfuse, and will occur even when the `fuse` package
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is included in `buildInputs`. It happens because libfuse headers throw an error
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on macOS if the `FUSE_USE_VERSION` macro is undefined. Many proejcts do define
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`FUSE_USE_VERSION`, but only inside C source files. This results in the above
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error at configure time because the configure script would attempt to compile
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sample FUSE programs without defining `FUSE_USE_VERSION`.
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There are two possible solutions for this problem in Nixpkgs:
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1. Pass `FUSE_USE_VERSION` to the configure script by adding
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`CFLAGS=-DFUSE_USE_VERSION=25` in `configureFlags`. The actual value would
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have to match the definition used in the upstream source code.
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2. Remove `AC_CHECK_HEADERS` / `AC_CHECK_LIBS` for libfuse.
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However, a better solution might be to fix the build script upstream to use
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`PKG_CHECK_MODULES` instead. This approach wouldn't suffer from the problem that
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`AC_CHECK_HEADERS`/`AC_CHECK_LIBS` has at the price of introducing a dependency
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on pkg-config.
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