make failed. fatal error: png.h: No such file or directory

[JustinhoCHN]

After cloning this repo (recursive), run make:

mkdir -p build && cd build
cmake ..
make

error raised:

In file included from /home/huzhihao/projects/TVM-deploy/src/classification/common.hpp:29:0,
                 from /home/huzhihao/projects/TVM-deploy/src/classification/classification.cpp:30:
/home/huzhihao/projects/TVM-deploy/src/classification/../CImg.h:448:10: fatal error: png.h: No such file or directory
 #include "png.h"
          ^~~~~~~
compilation terminated.
CMakeFiles/gcv_lite_classify.dir/build.make:86: recipe for target 'CMakeFiles/gcv_lite_classify.dir/src/classification/classification.cpp.o' failed
make[2]: *** [CMakeFiles/gcv_lite_classify.dir/src/classification/classification.cpp.o] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/gcv_lite_classify.dir/all' failed
make[1]: *** [CMakeFiles/gcv_lite_classify.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

Do we missed something?