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Build.md

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+# Eressea Docker
+To build the Docker Image call next command in the folder where `Dockerfile` is located:
+```
+docker build \
+    -t jacsid/eressea \
+    --build-arg eressea_branch=develop \
+    --build-arg echeck_branch=develop \
+    .
+```
+You can choose to build the image with [Eressea](https://github.com/eressea/server) **master** or **develop** branch.
+
+`EChecker` is currently under development. In the [GitHub Repository](https://github.com/eressea/echeck) only the master branch is available. Because this is the one, which is in active development, the Docker image uses the branch name **develop**.
+The older versions are available as Debian [package](https://packagecloud.io/enno/eressea). If you choose `echeck_branch=`**master** the image uses version 4.4.9 
+
+***But note: This version does not run with Debian. It fails with segmentation fault.***
+
+Hence you should bild the image with one of these options:
+* --build-arg eressea_branch=develop --build-arg echeck_branch=develop
+* --build-arg eressea_branch=master --build-arg echeck_branch=develop