are upgrading an older database or want to run the
[legacy tokenizer](../customize/Tokenizers.md#legacy-tokenizer) for
some other reason, you need to enable the PostgreSQL module via
- cmake: `cmake -DBUILD_MODULE=on ../Nominatim`
+ cmake: `cmake -DBUILD_MODULE=on ../Nominatim`. To compile the module
+ you need to have the server development headers for PostgreSQL installed.
+ On Ubuntu/Debian run: `sudo apt install postgresql-server-dev-<postgresql version>`
Nominatim installs itself into `/usr/local` per default. To choose a different