This applies to manual builds from downloaded source or builds by PythonZ.
Build notices like the following indicate what's missing:
The necessary bits to build these optional modules were not found:
_bz2 _dbm _gdbm
_sqlite3 _tkinter
To find the necessary bits, look in setup.py in detect_modules() for the module's name.
Or for disabled modules:
The following modules found by detect_modules() in setup.py have not
been built, they are *disabled* by configure:
_sqlite3
To find the necessary bits, look in setup.py in detect_modules() for the module's name.
Debian splits the standard python distribution into various sub-packages,
so that the python3 package itself is not a complete distribution. Other
parts you will probably want include:
python3-distutils distutils
python3-tk tkinter
When building from source, the following modules are not built unless the necessary development packages are installed. (This list may not be complete.)
_bz2 libbz2-dev
_dbm
_gdbm
_sqlite3 libsqlite3-dev
_tkinter tk-dev
Sometimes apt-get --dry-run build-dep can help with figuring out what you
need.