Failed to build occt with Enscripten due to cannot find freetype

Hi all,
Can anybody help to build occt with Enscripten?

I tried to build occt with enscripten:
1. Download occt source code, cmake, enscripten, etc.
2. Open cmake, set the source code path to occt;
3. Set the make program to E:/Github/emsdk/mingw/4.6.2_32bit/mingw32-make.exe;
4. Set the tool chain file to E:/Github/emsdk/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake;
5. Click configuration, error shows up:
CMake Error at CMakeLists.txt:746 (message):
Could not find headers of used third-party products:
3RDPARTY_FREETYPE_INCLUDE_DIR_ft2build
3RDPARTY_FREETYPE_INCLUDE_DIR_freetype2
6. Freetype is optional to occt, so I tried to skip it, remove the lines in CmakeLists.txt:
if (USE_FREETYPE)
message (STATUS "Info: Freetype is used by OCCT")
OCCT_INCLUDE_CMAKE_FILE ("adm/cmake/freetype")
else()
OCCT_CHECK_AND_UNSET_GROUP ("3RDPARTY_FREETYPE")
OCCT_CHECK_AND_UNSET ("3RDPARTY_FREETYPE_INCLUDE_DIR_freetype2")
OCCT_CHECK_AND_UNSET ("3RDPARTY_FREETYPE_INCLUDE_DIR_ft2build")
OCCT_CHECK_AND_UNSET ("INSTALL_FREETYPE")
endif()
7. Configuration and generate source code, try to build, get error, see occerror.png:
src\Font\Font_FontMgr.cxx: fatal error: 'ft2build.h' file not found

Then I also tried to build freetype from source code, and get stuck, see failed2buildft.png:
BROTLIDEC_INCLUDE_DIRS-NOTFOUND
BROTLIDEC_LIBRARIES-NOTFOUND
BZIP2_INCLUDE_DIR-NOTFOUND
BZIP2_LIBRARY_DEBUG-NOTFOUND
BZIP2_LIBRARY_RELEASE-NOTFOUND

Thanks,
Andy