config/options: ban spaces in paths

config/options

@@ -4,6 +4,12 @@ if [[ "${EUID}" -eq 0 ]]; then
   exit 1
 fi
 
+# Spaces in paths are verboten
+if [[ ${PWD} =~ [[:space:]] ]]; then
+  echo "Building in a folder that includes spaces is NOT supported. Use a folder without spaces." 1>&2
+  exit 1
+fi
+
 # set default language for buildsystem
 export LC_ALL=C