With reference to issue #504, I think that I have found the reason because the compilation of included FreeType failed when compiling with Visual Studio. The cause problem is the missing ZLIB_INCLUDE_DIRS inside target_include_directories() into extern/freetype/CMakeList.txt: if zlib.h is stored outside the includes of the toolchain, the build failed. Adding that thing has fixed my problem.
With reference to issue #504, I think that I have found the reason because the compilation of included FreeType failed when compiling with Visual Studio. The cause problem is the missing ZLIB_INCLUDE_DIRS inside target_include_directories() into extern/freetype/CMakeList.txt: if zlib.h is stored outside the includes of the toolchain, the build failed. Adding that thing has fixed my problem.