diff --git a/.gitignore b/.gitignore
index 54e6b48..9a16bcc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,4 @@ nohup.out
 /webapp/settingtypes-list.txt
 err.txt
 *.continuified.tmp
+linux-minetest-kit.zip
diff --git a/containers/lmk.devuan-chimaera.sh b/containers/lmk.devuan-chimaera.sh
new file mode 100755
index 0000000..589b7c3
--- /dev/null
+++ b/containers/lmk.devuan-chimaera.sh
@@ -0,0 +1,257 @@
+#!/bin/bash
+# See https://nextbreakpoint.com/posts/article-compile-code-with-docker.html
+# sudo docker build -t lmk-devuan-chimaera-img dyne/devuan:chimaera
+me=lmk.devuan-chimera.sh
+docker_path="`sudo command -v docker`"
+if [ ! -f "$docker_path" ]; then
+    cat <<END
+This script requires docker. For help, see
+<https://github.com/poikilos/linux-preinstall/blob/master/doc/Docker.md>
+or Docker's own documentation at
+<https://docs.docker.com/engine/install/>.
+END
+fi
+container_name="lmk-devuan-chimaera"
+image_name="lmk-devuan-chimaera-img"
+
+source $image_name/project.rc
+if [ $? -ne 0 ]; then
+    exit 1
+fi
+
+# sudo docker image inspect $image_name > /dev/null
+sudo docker image inspect $image_name --format "* docker is looking for the image..."
+# ^ appending ":latest" to the name also works.
+# ^ Get matching images as a JSON list (where each has "Id" and other
+#   metadata).
+if [ $? -ne 0 ]; then
+    if [ ! -d "$local_img_dir" ]; then
+        echo "Error: \"$local_img_dir\" (local_img_dir for storing $SRC_URL) doesn't exist."
+        exit 1
+    fi
+
+    if [ ! -f "$container_build_blob" ]; then
+        echo "* downloading $SRC_URL to $DL_SRC_PATH..."
+        curl "$SRC_URL" --progress-bar --output "$DL_SRC_PATH"
+        if [ $? -ne 0 ]; then
+            exit 1
+        fi
+        if [ ! -f "$container_build_blob" ]; then
+            echo "Error: This script requires \"$container_build_blob\"."
+            exit 1
+        fi
+    else
+        echo "* using existing \"$container_build_blob\" to build the container image"
+    fi
+    move_back="false"
+    prerelease_path=~/Downloads/minetest.org/insider-prerelease/linux-minetest-kit-220509.zip
+    if [ ! -f $container_build_blob ]; then
+        if [ -f "$prerelease_path" ]; then
+            move_back="true"
+            echo "mv $prerelease_path $container_build_blob"
+            mv $prerelease_path $container_build_blob
+            if [ $? -ne 0 ]; then
+                echo "* Error: the mv command failed."
+                exit 1
+            fi
+        fi
+    fi
+    sudo docker build -t $image_name $local_img_dir
+    code=$?
+    if [ "@move_back" = "@true" ]; then
+        echo "mv \"$prerelease_path\" \"$container_build_blob\""
+        mv "$container_build_blob" "$prerelease_path"
+        if [ $? -ne 0 ]; then
+            echo "* Warning: the mv command failed."
+        fi
+    fi
+    if [ $code -ne 0 ]; then
+        exit 1
+    fi
+else
+    echo "* The container will be built using the existing docker image $image_name"
+fi
+
+cat <<END
+How to use the image:
+  # docker options:
+  # -i: is interactive (attach STDIN).
+  # -d: is daemon mode.
+
+  sudo docker image ls
+  # ^ See what images are installed (one image can be used for many containers).
+
+  sudo docker rmi $image_name
+  # ^ Remove a docker image (This is necessary after updating the unversioned Docker image to avoid cached RUN commands from doing nothing when the script after RUN changes).
+
+  sudo docker image prune
+  # ^ Prune unused images (For this to do anything, first delete containers using the image).
+
+  sudo docker ps -a
+  # ^ List containers and show NAMES (The name is necessary for certain subcommands such as exec which operate on a running container).
+
+  sudo docker start $container_name
+  # ^ Start a container.
+
+  sudo docker run $container_name
+  # ^ "run" is merely a combination of "create" and "start"
+
+  sudo docker -w $contained_repo exec $container_name ls -l $contained_repos
+  # ^ Execute a command in a running container (exec shows an error if the container isn't running).
+  # This will not work if the run/start command that started the container isn't a command that keeps it open (runs indefinitely)!
+  # w: working directory
+
+  sudo docker stop $container_name
+  # ^ Stop a container by name (See <https://www.tecmint.com/name-docker-containers/>)
+  #   You must use the container name (as determined using the "ps" subcommand), not the image name.
+
+  sudo docker container run -it $image_name /bin/bash
+  # ^ Run an interactive terminal (Type 'exit' to exit)
+  #   (based on <https://phoenixnap.com/kb/docker-run-command-with-examples>)
+
+  sudo docker attach $container_name
+  # ^ Attach your current terminal to a running container (See
+  #   <https://docs.docker.com/engine/reference/commandline/attach/>).
+
+
+  sudo docker rm --force $container_name
+  # ^ Delete a container by its name.
+  # --force: kill and delete running containers as well.
+
+END
+
+# sudo docker container run -d --name $image_name unzip xvf $contained_arc -C $contained_repos
+container_Id=`sudo docker ps -aqf "name=$container_name"`
+# ^ ONLY works with container_name not image_name
+
+cat > /dev/null <<END
+if [ "@$container_Id" = "@" ]; then
+    echo "* creating a container named $container_name"
+    sudo docker create --name=$container_name $image_name
+    # ^ output is the Id
+    if [ $? -ne 0 ]; then
+        echo "FAILED"
+        exit 1
+    fi
+    container_Id=`sudo docker ps -aqf "name=$container_name"`
+    if [ -z "$container_Id" ]; then
+        echo "The container_Id couldn't be obtained from sudo docker ps -aqf \"name=$container_name\", so creating the named image failed."
+        exit 1
+    fi
+fi
+echo "container_Id=$container_Id"
+END
+
+printf "starting the docker image..."
+# sudo docker start $container_name
+# ^ NOTE: start is useless here since it won't stay open unless the
+#   command is set to "bash" or something, which isn't desirable.
+#   Therefore, use run instead of exec below.
+# ^ output is $container_name
+sudo docker run --name $container_name $image_name /opt/build-lmk.sh
+if [ $? -ne 0 ]; then
+    echo "FAILED"
+    exit 1
+else
+    echo "OK"
+fi
+# ^ NOTE: start is useless here since it won't stay open unless the
+#   command is set to "bash" or something, which isn't desirable.
+#   Therefore, use run instead of exec below.
+
+
+if [ "@$contained_repo" = "@" ]; then
+    echo "Error: contained_repo can't be blank or checking for its files in the container won't work."
+    exit 1
+fi
+
+contained_good_repo_flag_path="$contained_repo/$good_repo_flag_name"
+
+# sudo docker exec $container_name ls $contained_repo
+echo "* checking for $contained_good_repo_flag_path on the destination..."
+sudo docker exec $container_name ls $contained_good_repo_flag_path > /dev/null
+if [ $? -ne 0 ]; then
+    printf "NO...checking for unzip..."
+    container_unzip="`sudo docker exec $container_name which unzip`"
+    if [ "@$container_unzip" = "@" ]; then
+        echo "NO. Installing..."
+        # This should never happen if the Dockerfile was used.
+        sudo docker exec $container_name apt-get update
+        if [ $? -ne 0 ]; then exit 1; fi
+        sudo docker exec $container_name apt-get install -y unzip
+        if [ $? -ne 0 ]; then exit 1; fi
+        container_unzip="`sudo docker exec $container_name which unzip`"
+        if [ "@$container_unzip" = "@" ]; then
+            echo "Error: Installing unzip in the container did not succeed. Install unzip inside the container manually then try again, or extract linux-minetest-kit such that $contained_good_repo_flag_path exists."
+            exit 1
+        fi
+    else
+        echo "FOUND"
+    fi
+    # sudo docker container run $image_name unzip xvf $contained_arc -d $contained_repos
+    echo "* extracting $contained_arc"
+    sudo docker exec $container_name unzip $contained_arc -d $contained_repos
+    # -d: is destination, like -C or --directory for tar.
+    # -v: verbose (prevents extraction)
+    if [ $? -ne 0 ]; then
+        echo "Error: unzip failed within the container. Install unzip inside the container manually then try again, or extract linux-minetest-kit such that $contained_good_repo_flag_path exists."
+        exit 1
+    fi
+else
+    echo "FOUND (already extracted)"
+fi
+
+# sudo docker exec $container_name ls $contained_repo > /dev/null
+sudo docker exec $container_name ls $contained_good_repo_flag_path > /dev/null
+if [ $? -ne 0 ]; then
+    echo "Error: extracting linux-minetest-kit.zip in the container didn't work. Extract linux-minetest-kit.zip to $contained_repos such that $contained_good_repo_flag_path exists in the container and try again."
+    exit 1
+else
+    echo "* detected $contained_good_repo_flag_path (So the source directory is assumed to be ok)"
+fi
+
+
+
+if [ "@$contained_user" = "@" ]; then
+    echo "Error: contained_user can't be blank, or checking for the user within the container will not work."
+    exit 1
+fi
+
+sudo docker exec $container_name id -u $contained_user
+if [ $? -ne 0 ]; then
+    printf "* creating $contained_user in container $container_name..."
+    sudo docker exec $container_name adduser --disabled-password --gecos "" $contained_user --home $contained_home
+    if [ $? -ne 0 ]; then
+        echo "FAILED"
+        exit 1
+    else
+        echo "OK"
+    fi
+else
+    echo "* using the $container_name container's existing contained_user: $contained_user"
+fi
+
+# sudo docker container run --name $container_name $image_name ls $contained_repos
+
+# sudo docker exec $container_name chown -R $contained_user $contained_repos
+# ^ Usually you could do this, but run as root since this script is used to test the safety of linux-minetest-kit:
+
+# sudo docker exec $container_name curl https://raw.githubusercontent.com/poikilos/EnlivenMinetest/master/install-minetest-build-deps.sh --output /opt/install-minetest-build-deps.sh
+# sudo docker exec $container_name chmod +x $repo_build_assumptions_cmd
+# sudo docker exec $container_name $repo_build_assumptions_cmd
+
+# ^ moved to Dockerfile
+
+echo "* building libraries using $repo_build_libs_cmd..."
+sudo docker exec -w $contained_src $container_name $repo_build_libs_cmd
+if [ $? -ne 0 ]; then exit 1; fi
+# echo "* building program using $repo_build_cmd..."
+# sudo docker exec -w $contained_src $container_name $repo_build_cmd
+if [ $? -ne 0 ]; then exit 1; fi
+# -w: working directory
+
+
+# How to use docker-compose (See <https://docs.docker.com/compose/>):
+# "1. Define your app’s environment with a Dockerfile so it can be reproduced anywhere."
+# "2. Define the services that make up your app in docker-compose.yml so they can be run together in an isolated environment."
+# "3. Run docker compose up and the Docker compose command starts and runs your entire app. You can alternatively run docker-compose up using the docker-compose binary."
diff --git a/containers/lmk.devuan-chimaera/Dockerfile b/containers/lmk.devuan-chimaera/Dockerfile
new file mode 100644
index 0000000..6335531
--- /dev/null
+++ b/containers/lmk.devuan-chimaera/Dockerfile
@@ -0,0 +1,12 @@
+FROM dyne/devuan:chimaera
+# An absolute path for COPY doesn't work ('/' is removed from the beginning).
+COPY linux-minetest-kit.zip /opt
+COPY lmk.rc /opt
+COPY build-lmk.sh /opt
+RUN apt-get update
+RUN apt-get install -y unzip
+RUN unzip /opt/linux-minetest-kit.zip -d /opt
+# RUN  apt-get install -y sudo
+RUN curl https://raw.githubusercontent.com/poikilos/EnlivenMinetest/master/install-minetest-build-deps.sh --output /opt/install-minetest-build-deps.sh
+RUN chmod +x /opt/install-minetest-build-deps.sh
+RUN /opt/install-minetest-build-deps.sh
diff --git a/containers/lmk.devuan-chimaera/build-lmk.sh b/containers/lmk.devuan-chimaera/build-lmk.sh
new file mode 100755
index 0000000..b66d976
--- /dev/null
+++ b/containers/lmk.devuan-chimaera/build-lmk.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+cd /opt
+if [ $? -ne 0 ]; then
+    exit 1
+fi
+source lmk.rc
+if [ $? -ne 0 ]; then
+    exit 1
+fi
diff --git a/containers/lmk.devuan-chimaera/lmk.rc b/containers/lmk.devuan-chimaera/lmk.rc
new file mode 100644
index 0000000..afd1707
--- /dev/null
+++ b/containers/lmk.devuan-chimaera/lmk.rc
@@ -0,0 +1,33 @@
+contained_repos=/opt
+contained_arc="$contained_repos/linux-minetest-kit.zip"
+# ^ This must always be in sync with "COPY linux-minetest-kit.zip /opt" in Dockerfile
+contained_repo=$contained_repos/linux-minetest-kit
+contained_user=minebest
+contained_home=/home/$contained_user
+if [ "@$SRC_URL" = "@" ]; then
+    SRC_URL="https://downloads.minetest.org/linux-minetest-kit.zip"
+fi
+#if [ "@$DL_SRC_NAME" = "@" ]; then
+DL_SRC_NAME=linux-minetest-kit.zip
+#fi
+local_img_dir="lmk.devuan-chimaera"
+if [ ! -d "$local_img_dir" ]; then
+    echo "* $me must run from the directory containing the container image directory: $local_img_dir"
+    exit 1
+fi
+container_build_blob=$local_img_dir/linux-minetest-kit.zip
+# ^ local_img_dir has to be in the same directory as Dockerfile or
+#   the COPY command in the Dockerfile won't work.
+if [ "@$DL_SRC_PATH" = "@" ]; then
+    # DL_SRC_PATH="$HOME/Downloads/$DL_SRC_NAME"
+    DL_SRC_PATH="$local_img_dir"
+    # ^ $DL_SRC_PATH has to be in the same directory as Dockerfile or
+    #   the COPY command in the Dockerfile won't work.
+    #   The file should be added to .gitignore for the reason that it
+    #   is in the repo in the docker image directory.
+fi
+
+good_repo_flag_name="mtcompile-program.pl"
+repo_build_assumptions_cmd="/opt/install-minetest-build-deps.sh"
+repo_build_libs_cmd="./mtcompile-libraries.sh"
+repo_build_cmd="./mtcompile-program.pl --build --classic --client"
diff --git a/install-minetest-build-deps.sh b/install-minetest-build-deps.sh
index 496f9a6..606f929 100755
--- a/install-minetest-build-deps.sh
+++ b/install-minetest-build-deps.sh
@@ -2,9 +2,18 @@
 # Do not use sudo, in case sudo is not installed (such as in some
 # default installations including the dyne/devuan:chimaera docker image
 # on docker hub.
+customExit(){
+    >&2 echo "Error:"
+    echo "$1"
+    code=1
+    if [ "@$2" -ne "@" ]; then
+        code=$2
+    fi
+    exit $code
+}
 me=install-minetest-build-deps.sh
 if [ "$EUID" -ne 0 ]; then
-    echo "Error: $me must run as root."
+    >&2 echo "Error: $me must run as root."
     exit 1
 fi
 enable_postgres="false"