Hello

On a new project I did the following, but it wouldn’t compile without errors.
I also tried using the library locally, but had the same issue. {:hidraw, path: "../hidraw"}

First I added {:hidraw, "~> 0.2.2"} to the dependencies.

❯ mix deps.get

Resolving Hex dependencies…
Resolution completed in 0.134s
New:
hidraw 0.2.2
Unchanged:
bandit 1.10.3
cc_precompiler 0.1.11
db_connection 2.9.0
decimal 2.3.0
dns_cluster 0.2.0
ecto 3.13.5
ecto_sql 3.13.4
elixir_make 0.9.0
esbuild 0.10.0
expo 1.1.1
file_system 1.1.1
finch 0.21.0
fine 0.1.4
gettext 1.0.2
hpax 1.0.3
idna 6.1.1
jason 1.4.4
lazy_html 0.1.10
mime 2.0.7
mint 1.7.1
nimble_options 1.1.1
nimble_pool 1.1.0
phoenix 1.8.4
phoenix_ecto 4.7.0
phoenix_html 4.3.0
phoenix_live_dashboard 0.8.7
phoenix_live_reload 1.6.2
phoenix_live_view 1.1.24
phoenix_pubsub 2.2.0
phoenix_template 1.0.4
plug 1.19.1
plug_crypto 2.1.1
postgrex 0.22.0
req 0.5.17
swoosh 1.22.1
tailwind 0.4.1
telemetry 1.3.0
telemetry_metrics 1.1.0
telemetry_poller 1.3.0
thousand_island 1.4.3
unicode_util_compat 0.7.1
websock 0.5.3
websock_adapter 0.5.9

* Getting hidraw (Hex package)

❯ mix deps.compile
==> elixir_make
Compiling 8 files (.ex)
Generated elixir_make app
==> hidraw
Unchecked dependencies for environment prod:

* elixir_make (Hex package)
  the dependency build is outdated, please run “MIX_ENV=prod mix deps.compile”
  could not compile dependency :hidraw, “mix compile” failed. Errors may have been logged above. You can recompile this dependency with “mix deps.compile hidraw --force”, update it with “mix deps.update hidraw” or clean it with “mix deps.clean hidraw”
  ==> phoenix_hidraw_error
  \*\* (Mix) Can’t continue due to errors on dependencies

I could ‘temporarily fix’ it locally by running 2x mix deps.compile hidraw. But I’m looking for a solution which will let me use deps_nix without any issues.

   ❯ mix deps.compile hidraw
==> elixir_make
Compiling 8 files (.ex)
Generated elixir_make app
==> hidraw
Unchecked dependencies for environment prod:
* elixir_make (Hex package)
  could not find an app file at "/phoenix_hidraw_error/_build/dev/lib/elixir_make/ebin/elixir_make.app". This may happen if the dependency was not yet compiled or the dependency indeed has no app file (then you can pass app: false as option)
could not compile dependency :hidraw, "mix compile" failed. Errors may have been logged above. You can recompile this dependency with "mix deps.compile hidraw --force", update it with "mix deps.update hidraw" or clean it with "mix deps.clean hidraw"
==> phoenix_hidraw_error
** (Mix) Can't continue due to errors on dependencies

❯ mix deps.compile hidraw
==> hidraw
mkdir -p /phoenix_hidraw_error/_build/dev/lib/hidraw/obj
mkdir -p /phoenix_hidraw_error/_build/dev/lib/hidraw/priv
gcc -c -I/nix/store/j106gi4wjl8kqr1yxgw35arb4jih4iw4-erlang-28.3.1/lib/erlang/usr/include -std=gnu99 -o /phoenix_hidraw_error/_build/dev/lib/hidraw/obj/erlcmd.o src/erlcmd.c
gcc -c -I/nix/store/j106gi4wjl8kqr1yxgw35arb4jih4iw4-erlang-28.3.1/lib/erlang/usr/include -std=gnu99 -o /phoenix_hidraw_error/_build/dev/lib/hidraw/obj/hidraw.o src/hidraw.c
gcc -c -I/nix/store/j106gi4wjl8kqr1yxgw35arb4jih4iw4-erlang-28.3.1/lib/erlang/usr/include -std=gnu99 -o /phoenix_hidraw_error/_build/dev/lib/hidraw/obj/hidraw_enum.o src/hidraw_enum.c
src/hidraw_enum.c: In function âfind_hidraw_devicesâ:
src/hidraw_enum.c:130:30: warning: â%sâ directive output may be truncated writing up to 255 bytes into a region of size 59 [-Wformat-truncation=]
  130 |                          "%s/%s", DEV, namelist[i]->d_name);
      |                              ^~
In file included from /nix/store/1k8f0lkj10gsbb1fh0idr1423l37yj69-glibc-2.40-218-dev/include/stdio.h:970,
                 from src/hidraw_enum.c:29:
In function âsnprintfâ,
    inlined from âfind_hidraw_devicesâ at src/hidraw_enum.c:129:3:
/nix/store/1k8f0lkj10gsbb1fh0idr1423l37yj69-glibc-2.40-218-dev/include/bits/stdio2.h:68:10: note: â__builtin___snprintf_chkâ output between 6 and 261 bytes into a destination of size 64
   68 |   return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   69 |                                    __glibc_objsize (__s), __fmt,
      |                                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   70 |                                    __va_arg_pack ());
      |                                    ~~~~~~~~~~~~~~~~~
gcc /phoenix_hidraw_error/_build/dev/lib/hidraw/obj/erlcmd.o /phoenix_hidraw_error/_build/dev/lib/hidraw/obj/hidraw.o /phoenix_hidraw_error/_build/dev/lib/hidraw/obj/hidraw_enum.o -L/nix/store/j106gi4wjl8kqr1yxgw35arb4jih4iw4-erlang-28.3.1/lib/erlang/usr/lib -lei  -o /phoenix_hidraw_error/_build/dev/lib/hidraw/priv/hidraw
echo "Not crosscompiling. To test locally, the port binary needs extra permissions."; echo "Set SUDO=sudo to set permissions. The default is to skip this step."; echo "SUDO_ASKPASS=/usr/bin/ssh-askpass"; echo "SUDO=true"; SUDO_ASKPASS=/usr/bin/ssh-askpass true -- sh -c 'chown root:root  /phoenix_hidraw_error/_build/dev/lib/hidraw/priv/hidraw; chmod +s  /phoenix_hidraw_error/_build/dev/lib/hidraw/priv/hidraw'
Not crosscompiling. To test locally, the port binary needs extra permissions.
Set SUDO=sudo to set permissions. The default is to skip this step.
SUDO_ASKPASS=/usr/bin/ssh-askpass
SUDO=true
Compiling 1 file (.ex)
    warning: using single-quoted strings to represent charlists is deprecated.
    Use ~c"" if you indeed want a charlist or use "" instead.
    You may run "mix format --migrate" to change all single-quoted
    strings to use the ~c sigil and fix this warning.
    │
  9 │     executable = :code.priv_dir(:hidraw) ++ '/hidraw'
    │                                             ~
    │
    └─ lib/hidraw.ex:9:45

    warning: using single-quoted strings to represent charlists is deprecated.
    Use ~c"" if you indeed want a charlist or use "" instead.
    You may run "mix format --migrate" to change all single-quoted
    strings to use the ~c sigil and fix this warning.
    │
 34 │     executable = :code.priv_dir(:hidraw) ++ '/hidraw'
    │                                             ~
    │
    └─ lib/hidraw.ex:34:45
❯ uname -a
Linux sl-p16 6.18.13 #1-NixOS SMP PREEMPT_DYNAMIC Thu Feb 19 15:31:37 UTC 2026 x86_64 GNU/Linux
Generated hidraw app

❯ elixir --version
Erlang/OTP 28 \[erts-16.2\] \[source\] \[64-bit\] \[smp:32:32\] \[ds:32:32:10\] \[async-threads:1\] \[jit:ns\]

Elixir 1.19.5 (compiled with Erlang/OTP 28)

❯ uname -a
Linux laptop 6.18.13 [#1](/nerves-web-kiosk/hidraw/issues/1)-NixOS SMP PREEMPT_DYNAMIC Thu Feb 19 15:31:37 UTC 2026 x86_64 GNU/Linux