```
[1/322] Building C object CMakeFiles/glew.dir/src/engine/external/glew/glew.c.o
FAILED: CMakeFiles/glew.dir/src/engine/external/glew/glew.c.o
/usr/bin/cc -DGLEW_STATIC -I/home/runner/work/ddnet/ddnet/src/engine/external/glew -g -fdiagnostics-color=always -fstack-protector-strong -fno-exceptions -fsigned-char -Wno-implicit-function-declaration -MD -MT CMakeFiles/glew.dir/src/engine/external/glew/glew.c.o -MF CMakeFiles/glew.dir/src/engine/external/glew/glew.c.o.d -o CMakeFiles/glew.dir/src/engine/external/glew/glew.c.o -c /home/runner/work/ddnet/ddnet/src/engine/external/glew/glew.c
In file included from /home/runner/work/ddnet/ddnet/src/engine/external/glew/glew.c:34:
/home/runner/work/ddnet/ddnet/src/engine/external/glew/GL/glew.h:1205:14: fatal error: GL/glu.h: No such file or directory
1205 | # include <GL/glu.h>
| ^~~~~~~~~~
compilation terminated.
[2/322] Building C object CMakeFiles/wavpack.dir/src/engine/external/wavpack/float.c.o
```
The actual work will be fixing those or at least
NOLINT(clang-analyzer-optin.cplusplus.VirtualCall) them so we can enable
this. Disable checks that we don't want.
Exclude external directory from clang-tidy.