We tried to rebuild mongodb by building.md, after executing the python.exe buildscripts/scons.py all -j4 command, the error will always be reported as below: 

C:\Python\Python37\python.exe src\mongo\base\generate_error_codes.py src\mongo\base\error_codes.yml src\mongo\base\error
_codes.tpl.h build\opt\mongo\base\error_codes.h
Traceback (most recent call last):
  File "src\mongo\base\generate_error_codes.py", line 31, in <module>
    from Cheetah.Template import Template
ModuleNotFoundError: No module named 'Cheetah'

And we checked the 'src\mongo\base\generate_error_codes.py' file, but I don't understand why this error was reported: ModuleNotFoundError: No module named 'Cheetah' . Could you please help to take a look at this issue? Is there any configuration missing? Thanks in advance!

 
Reproduce steps:
1. git clone -c core.autocrlf=true https://github.com/mongodb/mongo   F:\git_projects\mongodb\mongo
2. Open a VS 2017 x64 command prompt and browse to F:\git_projects\mongodb\mongo
3. pip.exe install --user -r .\etc\pip\dev-requirements.txt
4. python.exe buildscripts/scons.py all -j4

Note: 

F:\git_projects\mongodb\mongo> python --version
Python 3.7.4
Acutal result:

scons: Reading SConscript files ...
scons: running with args C:\Python\Python37\python.exe buildscripts/scons.py all -j4
scons version: 3.1.1
python version: 3 7 4 'final' 0
CC is cl
cl was not found in $PATH
cl resolves to F:\git_projects\mongodb\mongo\cl
CXX is $CC
$CC was not found in $PATH
$CC resolves to F:\git_projects\mongodb\mongo\$CC
Checking whether the C compiler works... (cached) yes
Checking whether the C++ compiler works... (cached) yes
Checking that the C++ compiler can link a C++ program... (cached) yes
Checking if C++ compiler "$CC" is MSVC... (cached) yes
Checking if C compiler "cl" is MSVC... (cached) yes
Detected a x86_64 processor
Checking if target OS windows is supported by the toolchain... (cached) yes
Checking if C compiler is Microsoft Visual Studio 2017 15.9 or newer...(cached) yes
Checking if C++ compiler is Microsoft Visual Studio 2017 15.9 or newer...(cached) yes
Checking if we are using libstdc++... (cached) no
Checking for C++17... (cached) yes
Checking for memset_s... (cached) no
Checking for C function strnlen()... (cached) yes
Checking Windows SDK is 8.1 or newer... (cached) yes
Checking if we are on a POSIX system... (cached) no
Checking for storage class thread_local (cached) yes
Checking for C++14 std::enable_if_t support...(cached) yes
Using SSL Provider: windows
Checking for C++ header file execinfo.h... (cached) no
Checking for C library pcap... (cached) no
Checking for C library wpcap... (cached) no
Checking if std::atomic<int64_t> works... (cached) yes
Checking if std::atomic<uint64_t> works... (cached) yes
Checking if std::atomic<int32_t> works... (cached) yes
Checking if std::atomic<uint32_t> works... (cached) yes
Checking for extended alignment 64 for concurrency types... (cached) yes
Checking for mongoc_get_major_version() in C library mongoc-1.0... (cached) no
Checking for C function fallocate()... (cached) no
Checking for C function sync_file_range()... (cached) no
Checking for C header file x86intrin.h... (cached) no
Checking for C header file arm_neon.h... (cached) no
scons: done reading SConscript files.
scons: Building targets ...
C:\Python\Python37\python.exe buildscripts/idl/idlc.py --include src --base_dir build/opt --target_arch x86_64 --header
build\opt\mongo\db\repl\rollback_gen.h --output build\opt\mongo\db\repl\rollback_gen.cpp src\mongo\db\repl\rollback.idl
C:\Python\Python37\python.exe src\mongo\base\generate_error_codes.py src\mongo\base\error_codes.yml src\mongo\base\error
_codes.tpl.h build\opt\mongo\base\error_codes.h
Traceback (most recent call last):
  File "src\mongo\base\generate_error_codes.py", line 31, in <module>
    from Cheetah.Template import Template
ModuleNotFoundError: No module named 'Cheetah'
C:\Python\Python37\python.exe buildscripts/idl/idlc.py --include src --base_dir build/opt --target_arch x86_64 --header
build\opt\mongo\rpc\metadata\impersonated_user_metadata_gen.h --output build\opt\mongo\rpc\metadata\impersonated_user_me
tadata_gen.cpp src\mongo\rpc\metadata\impersonated_user_metadata.idl
C:\Python\Python37\python.exe buildscripts/idl/idlc.py --include src --base_dir build/opt --target_arch x86_64 --header
build\opt\mongo\db\repl\repl_settings_gen.h --output build\opt\mongo\db\repl\repl_settings_gen.cpp src\mongo\db\repl\rep
l_settings.idl
scons: *** [build\opt\mongo\base\error_codes.h] Error 1
scons: building terminated because of errors.
build\opt\mongo\base\error_codes.h failed: Error 1