I am on macOS version 10.13.6. There is one recent change that now breaks the build on macOS 10.13, since the function backtrace_from_fp() appears not to exist in my older version of macOS. In the latest release, the linker fails with a symbol not found error for _backtrace_from_fp

Latest release file sentry_unwinder_libbacktrace.c has

    if (addr) {
#if defined(SENTRY_PLATFORM_MACOS) && __has_builtin(__builtin_available)
        if (__builtin_available(macOS 10.14, *))
            return (size_t)backtrace_from_fp(addr, ptrs, (int)max_frames);
#endif
        return 0;
    }

Previous releases that built in 10.13

    if (addr) {
#ifdef MAC_OS_X_VERSION_10_14
        return backtrace_from_fp(addr, ptrs, max_frames);
#endif
        return 0;
    }

I am hoping that you can make this work?