+[context is set up correctly](../appendix/Install-on-Centos-7.md#adding-selinux-security-settings).
+
+When you recently updated your operating system, updated PostgreSQL to
+a new version or moved files (e.g. the build directory) you should
+recreate `nominatim.so`. Try
+
+```
+ cd build
+ rm -r module/
+ cmake $main_Nominatim_path && make
+```