--- a/configure	Mon Oct 01 15:31:14 2018 +0100
+++ b/configure	Mon Oct 01 15:32:47 2018 +0100
@@ -418,8 +418,16 @@
 
 if [ "$lua_interp_found" != "yes" -a "$RUNWITH_SET" != "yes" ]
 then
-   [ "$LUA_VERSION_SET" ] && { interp="Lua $LUA_VERSION" ;} || { interp="Lua" ;}
-   [ "$LUA_DIR_SET" -o "$LUA_BINDIR_SET" ] && { where="$LUA_BINDIR" ;} || { where="\$PATH" ;}
+   if [ "$LUA_VERSION_SET" ]; then
+      interp="Lua $LUA_VERSION";
+   else
+      interp="Lua";
+   fi
+   if [ "$LUA_DIR_SET" -o "$LUA_BINDIR_SET" ]; then
+      where="$LUA_BINDIR";
+   else
+      where="\$PATH";
+   fi
    echo "$interp interpreter not found in $where"
    die "You may want to use the flags --with-lua, --with-lua-bin and/or --lua-suffix. See --help."
 fi