Can't build audiopus_sys with new CMake due to version 3.5 deprecation

[lemon-sh]

When trying to compile audiopus or any other audiopus_sys-dependent crate on a system with CMake 4.0+ installed, the build fails with the following output:

lemonsh@mac ~/Documents/audiopus :3 cargo build
    Updating crates.io index
     Locking 7 packages to latest compatible versions
   Compiling shlex v1.3.0
   Compiling pkg-config v0.3.32
   Compiling log v0.4.27
   Compiling cc v1.2.26
   Compiling cmake v0.1.54
   Compiling audiopus_sys v0.2.2
error: failed to run custom build command for `audiopus_sys v0.2.2`

Caused by:
  process didn't exit successfully: `/Users/lemonsh/Documents/audiopus/target/debug/build/audiopus_sys-c9123c9901198384/build-script-build` (exit status: 101)
  --- stdout
  cargo:info=No feature or environment variable found, linking by default.
  cargo:rerun-if-env-changed=OPUS_NO_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG_x86_64-apple-darwin
  cargo:rerun-if-env-changed=PKG_CONFIG_x86_64_apple_darwin
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH_x86_64-apple-darwin
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH_x86_64_apple_darwin
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_PATH
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_x86_64-apple-darwin
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_x86_64_apple_darwin
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_LIBDIR
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_x86_64-apple-darwin
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_x86_64_apple_darwin
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_SYSROOT_DIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH_x86_64-apple-darwin
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH_x86_64_apple_darwin
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_PATH
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_x86_64-apple-darwin
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_x86_64_apple_darwin
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_LIBDIR
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_x86_64-apple-darwin
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_x86_64_apple_darwin
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_SYSROOT_DIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR
  cargo:info=`pkg_config` could not find `Opus`.
  cargo:info=Opus source path used: "/Users/lemonsh/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/audiopus_sys-0.2.2/opus".
  cargo:info=Building Opus via CMake.
  CMAKE_TOOLCHAIN_FILE_x86_64-apple-darwin = None
  CMAKE_TOOLCHAIN_FILE_x86_64_apple_darwin = None
  HOST_CMAKE_TOOLCHAIN_FILE = None
  CMAKE_TOOLCHAIN_FILE = None
  CMAKE_GENERATOR_x86_64-apple-darwin = None
  CMAKE_GENERATOR_x86_64_apple_darwin = None
  HOST_CMAKE_GENERATOR = None
  CMAKE_GENERATOR = None
  CMAKE_PREFIX_PATH_x86_64-apple-darwin = None
  CMAKE_PREFIX_PATH_x86_64_apple_darwin = None
  HOST_CMAKE_PREFIX_PATH = None
  CMAKE_PREFIX_PATH = None
  CMAKE_x86_64-apple-darwin = None
  CMAKE_x86_64_apple_darwin = None
  HOST_CMAKE = None
  CMAKE = None
  running: cd "/Users/lemonsh/Documents/audiopus/target/debug/build/audiopus_sys-e18db0444fb46ed9/out/build" && CMAKE_PREFIX_PATH="" LC_ALL="C" "cmake" "/Users/lemonsh/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/audiopus_sys-0.2.2/opus" "-DCMAKE_OSX_ARCHITECTURES=x86_64" "-DCMAKE_INSTALL_PREFIX=/Users/lemonsh/Documents/audiopus/target/debug/build/audiopus_sys-e18db0444fb46ed9/out" "-DCMAKE_C_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64 --target=x86_64-apple-macosx -mmacosx-version-min=15.4" "-DCMAKE_C_COMPILER=/usr/bin/cc" "-DCMAKE_CXX_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64 --target=x86_64-apple-macosx -mmacosx-version-min=15.4" "-DCMAKE_CXX_COMPILER=/usr/bin/c++" "-DCMAKE_ASM_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64 --target=x86_64-apple-macosx -mmacosx-version-min=15.4" "-DCMAKE_ASM_COMPILER=/usr/bin/cc" "-DCMAKE_BUILD_TYPE=Debug"
  -- Configuring incomplete, errors occurred!

  --- stderr
  CMake Error at CMakeLists.txt:1 (cmake_minimum_required):
    Compatibility with CMake < 3.5 has been removed from CMake.

    Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
    to tell CMake that the project requires at least <min> but has been updated
    to work with policies introduced by <max> or earlier.

    Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.



  thread 'main' panicked at /Users/lemonsh/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/cmake-0.1.54/src/lib.rs:1119:5:

  command did not execute successfully, got: exit status: 1

  build script failed, must exit now
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

I'm on macOS 15 (Intel) and CMake 4.0.2.

[dfontana]

Given the activity on this repo it may be looking somewhat grim; but it appears newer cmake versions bundled with MacOS (>4) are incompatible. I was able to get this working with a small wrapper in my case:

• Before the build:
  export CMAKE_x86_64_unknown_linux_gnu=$(pwd)/bin/cmake-wrapper
• And the wrapper:

#!/bin/bash
# Wrapper for cmake that adds the policy version flag
if [[ "$1" == "--build" ]]; then
    # For build commands, don't add the policy flag and filter out --parallel with number
    args=()
    skip_next=false
    for arg in "$@"; do
        if $skip_next; then
            skip_next=false
            continue
        fi
        if [[ "$arg" == "--parallel" ]]; then
            skip_next=true
            continue
        fi
        args+=("$arg")
    done
    exec cmake "${args[@]}"
else
    # For configure commands, add the policy flag
    exec cmake -DCMAKE_POLICY_VERSION_MINIMUM=3.5 "$@"
fi

Maybe it'll work for you too.

[lemon-sh]

Neat, but for now I just created my own fork and updated its opus dependency (which also spawned a waterfall of other issues)