[Cin] zscale's tonemapping on input

[Andrea paz]

I copied and pasted your line:

EXTRA_LIBS=" -lOpenCL -lSvtAv1Enc -lvpl -ldav1d -lxvidcore -lass
-lbluray -lsnappy -lzimg -lplacebo -lshaderc_shared"

I have also tried just “-lzimg”.
I have also tried several variations (along with or without your line) of:

export EXTRA_LDFLAGS=' -L/usr/lib/libzimg.so /usr/lib/libzimg.so.2
/usr/lib/libzimg.so.2.0.0 -L/usr/lib/pkgconfig/zimg.pc'
export EXTRA_CFLAGS=' -I/usr/include/zimg++.hpp /usr/include/zimg.h'