PostgreSQL 7.2.1 Documentation
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# 26.2. Installation

To build PL/Python, the `--with-python` option needs to be specified when running `configure`. If after building and installing you have a file called `plpython.so` (possibly a different extension), then everything went well. Otherwise you should have seen a notice like this flying by:

    *** Cannot build PL/Python because libpython is not a shared library.
    *** You might have to rebuild your Python installation.  Refer to
    *** the documentation for details.

That means you have to rebuild (part of) your Python installation to supply this shared library.

The catch is that the Python distribution or the Python maintainers do not provide any direct way to do this. The closest thing we can offer you is the information in Python FAQ 3.30. On some operating systems you don't really have to build a shared library, but then you will have to convince the PostgreSQL build system of this. Consult the `Makefile` in the `src/pl/plpython` directory for details.

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