add MultiCraft build script

build-MultiCraft.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+#two-line version:
+# if [! -f CMakeLists.txt ]; then git clone https://github.com/MultiCraft/MultiCraft.git && cd MultiCraft || exit 1; fi
+# cmake . -DOpenGL_GL_PREFERENCE=GLVND && make
+
+me="$0"
+customDie() {
+    echo
+    echo
+    echo "$me ERROR:"
+    echo $1
+    echo
+    exit 1
+}
+goodFlagFile=MultiCraft/CMakeLists.txt
+if [ -f "`which git`" ]; then
+    if [ ! -d MultiCraft ]; then
+        git clone https://github.com/MultiCraft/MultiCraft.git || customDie "Cannot clone MultiCraft from `pwd`"
+        cd MultiCraft || customDie "Cannot cd MultiCraft from `pwd`"
+    else
+        cd MultiCraft || customDie "Cannot cd MultiCraft from `pwd`"
+        git pull || customDie "Cannot pull MultiCraft from `pwd`"
+    fi
+else
+    if [ ! -f "$goodFlagFile" ]; then
+        customDie "You are missing git, and offline install is not possible without in current directory (`pwd`)"
+    else
+        cd MultiCraft || customDie "Cannot cd MultiCraft from `pwd`"
+    fi
+fi
+srcPath=.
+flag1="-DOpenGL_GL_PREFERENCE=GLVND"
+echo
+echo "Running cmake srcPath..."
+cmake $srcPath $flag1 || customDie "cmake failed. See any messages above for more information."
+echo
+echo "Running make..."
+make
+echo "Done."