Build fails due to missing "filter.h"
The build fails on Linux due to a missing include file:
In file included from apngreader.h:43,
from qimgprov.h:39,
from qcontrol.h:67,
from main.cpp:49:
levelfilter.h:4:10: fatal error: filter.h: No such file or directory
4 | #include "filter.h"
| ^~~~~~~~~~
compilation terminated.
Looking in "app/levelfilter.h", the "filter.h" is needed for non-Apple builds:
#if !defined(__APPLE__)
#include "filter.h"
#endif
However, "filter.h" is nowhere to be found in the git repository, and it doesn't seem like something belonging to a third-party package.