Building for Windows error: can't open zlib.h

[kpg]

Follow the instruction, Building for Windows(https://github.com/dolphin-emu/dolphin/wiki/Building-for-Windows), get can't open zlib.h error in Windows 10 & Visual Studio Community 2019.

Any hint?

Error (active) E1696 cannot open source file "zlib.h" minizip.lib (Externals\minizip\minizip.lib) - Release D:\project\dolphin\Externals\minizip\ioapi.h 21 
Error (active) E1696 cannot open source file "zlib.h" minizip.lib (Externals\minizip\minizip.lib) - Release D:\project\dolphin\Externals\minizip\unzip.c 25
Error (active) E1696 cannot open source file "zlib.h" minizip.lib (Externals\minizip\minizip.lib) - Release D:\project\dolphin\Externals\minizip\unzip.h 25