mumble-voip_mumble/docs/dev/build-instructions/common_build_errors.md

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# Common build errors
This page is supposed to give a summary of the most common build errors that are encountered when building Mumble and how to fix them.
| Error message | Description and fix |
| ------------- | ------------------- |
| inlining failed in call to always_inline vdupq_n_f32: target specific option mismatch | This error message occurs when attempting to build Opus. It seems to be an issue specific to the Raspberry Pi (4) (or maybe to ARM in general). This is a [known problem in Opus](https://github.com/xiph/opus/issues/203).<br><br>It can be fixed relatively easy by specifying `-DOPUS_DISABLE_INTRINSICS=ON` when invoking CMake. |
|CMake Error at cmake/qt-utils.cmake:6 (include):<br> include could not find requested file:<br><br> FindPythonInterpreter<br>Call Stack (most recent call first):<br> <br>src/murmur/CMakeLists.txt:16 (include) | Submodules are outdated<br> Run the command 'git submodule update --init' |