--- cmscontrib/gerpythonformat/templates/lg/graphdrawing.tex	2019-02-01 20:37:11.175618929 +0100
+++ /tmp/graphdrawing.tex	2019-02-01 20:45:34.593613925 +0100
@@ -2,6 +2,42 @@
 \usetikzlibrary{graphs}
 \usetikzlibrary{graphdrawing}
 
+\usepackage{luacode}
+\begin{luacode}
+  function pgf_lookup_and_require(name)
+    local sep = '/'
+    if string.find(os.getenv('PATH'),';') then
+      sep = '\string\\'
+    end
+    local function lookup(name)
+      local sub = name:gsub('%.',sep)
+      local find_func = function (name, suffix)
+        if resolvers then
+          local n = resolvers.findfile (name.."."..suffix, suffix) -- changed
+          return (not (n == '')) and n or nil
+        else
+          return kpse.find_file(name,suffix)
+        end
+      end
+      if find_func(sub, 'lua') then
+        require(name)
+      elseif find_func(sub, 'clua') then
+        collectgarbage('stop')
+        require(name)
+        collectgarbage('restart')
+      else
+        return false
+      end
+      return true
+    end
+    return
+      lookup('pgf.gd.' .. name .. '.library') or
+      lookup('pgf.gd.' .. name) or
+      lookup(name .. '.library') or
+      lookup(name)
+  end
+\end{luacode}
+
 \usegdlibrary{force, layered}
 
 \directlua{require("graphdrawing.lua")}