Update README about the available features behind cmake options.

README.md

@@ -19,7 +19,7 @@ This provides a shell inside a docker container at the source repository with th
 
 Flexfringe uses CMake as a build tool.
 
-We tested the toolchains on Linux (Ubuntu 16+), MacOS (10.14), and Windows 10.
+We tested the toolchains on Linux (Debian 12+), MacOS (10.14), and Windows 10.
 
 ## Linux and MacOS
 
@@ -31,6 +31,8 @@ You can build and compile the flexfringe project by running in the main director
 
 This builds the executable named *flexfringe*.
 
+Only run the last command in the build folder during development when you change the code.
+
 ## Windows
 
 ### MSYS2 with CLion
@@ -67,16 +69,34 @@ Reference: https://www.jetbrains.com/help/clion/quick-tutorial-on-configuring-cl
 
 The executable is now available in `build\Debug\flexfringe.exe`.
 
+Only run the last command during development when you change the code.
+
 This should also be possible to be done/configured from an IDE such as Visual Studio itself, CLion, or VS Code, etc.
 
 ## Additionally features
 
 ### Database
 
-Database: https://stackoverflow.com/a/10364240
+Database support is available behind the feature flag `ENABLE_DATABASE`. Enable during cmake configuration with `-DENABLE_DATABASE`.
+
+On Debian-based systems install dependencies with `sudo apt-get install libpq-dev` and `sudo apt-get install postgres` if you also want to actually use the database.
+
+On MacOS install with Homebrew using `brew install libpq` and `brew install postgres` for the full database package. Alternatively install with MacPorts using `port install postgresxx` where xx is the version number of the postgresql version you want. 
+
+On Windows install from: https://www.postgresql.org/download/
 
 ### Deep Learning
 
+Deep learning is done with python integration. This support is available behind the feature flag `ENABLE_PYTHON`. Enable during cmake configuration with `-DENABLE_PYTHON`.
+
+On Debian-based systems install dependencies with `sudo apt-get install python3-dev`.
+
+On MacOS install with Homebrew using `brew install python3` or MacPorts using `brew install python3xx` where xx is again the desired version number.
+
+On Windows install from: https://www.python.org/downloads/
+
+NB. On Windows the Python extension could not be successfully linked with the MSVC toolchain the last time this was checked. Use the MSYS2 toolchain in CLion instead.
+
 ### SAT Solver
 
 For expert users: In case you want to use the reduction to SAT and automatically invoke the SAT solver, you need to provide the path to the solver binary. flexfringe has been tested with lingeling (which you can get from http://fmv.jku.at/lingeling/ and run its build.sh).