Arch Linux

Description:
I was compiling an opencv program and I had undefined references to libraries in packages: vtk, glew, and hdf5. I didn't use specifically any one of them. Using `pkg-config --libs opencv4`.

Additional info:
* package version(s)
4.1.0-2
* config and/or log files etc.
* link to upstream bug report, if any

Steps to reproduce:
1. Uninstall any of the listed dependencies (vtk, glew, hdf5).
2. Create file a.cpp with contents (not even including a header):

int main() {return 0;}

3. Compile with g++ `pkg-config --cflags --libs opencv4` a.cpp
4. See undefined reference errors