\newif\iftempvar{}
%\redundefcitetrue{}
%\tempvarfalse{}
\tempvartrue{}
\iftempvar{}
    % http://tex.stackexchange.com/questions/300022/replace-undefined-reference-with-custom-text/300063#300063
    % chktex-file 26
    \usepackage{etoolbox}
    %\newcommand*{\undeffmt}[1]{\textcolor{red}{ref (#1)}}%
    \newcommand*{\undeffmt}[1]{\textcolor{red}{#1}}%
    \newcommand*{\patchsuccess}[1]{\typeout{Etoolbox patch: Success for \string#1}}
    \newcommand*{\patchfailure}[1]{\typeout{Etoolbox patch: Failure for \string#1}}
\makeatletter

\patchcmd{\@setcref}%
  {\nfss@text{\reset@font\bfseries ??}}
  {\nfss@text{\reset@font\undeffmt{#1}}}
  {\patchsuccess{\@setcref}}
  {\patchfailure{\@setcref}}

\patchcmd{\@setcrefrange}%
  {\nfss@text{\reset@font\bfseries ??}}%
  {\nfss@text{\reset@font\undeffmt{#1}}}
  {\patchsuccess{\@setcrefrange}}
  {\patchfailure{\@setcrefrange}}
\patchcmd{\@setcrefrange}%
  {\nfss@text{\reset@font\bfseries ??}}%
  {\nfss@text{\reset@font\undeffmt{#2}}}
  {\patchsuccess{\@setcrefrange}}
  {\patchfailure{\@setcrefrange}}
\patchcmd{\@setcrefrange}%
  {\nfss@text{\reset@font\bfseries ??}}%
  {\nfss@text{\reset@font\undeffmt{#1}}}
  {\patchsuccess{\@setcrefrange}}
  {\patchfailure{\@setcrefrange}}
\patchcmd{\@setcrefrange}%
  {\nfss@text{\reset@font\bfseries ??}}%
  {\nfss@text{\reset@font\undeffmt{#2}}}
  {\patchsuccess{\@setcrefrange}}
  {\patchfailure{\@setcrefrange}}

\patchcmd{\@setnamecref}%
  {\nfss@text{\reset@font\bfseries ??}}%
  {\nfss@text{\reset@font\undeffmt{#1}}}
  {\patchsuccess{\@setnamecref}}
  {\patchfailure{\@setnamecref}}

\patchcmd{\@setcpageref}%
  {\nfss@text{\reset@font\bfseries ??}}%
  {\nfss@text{\reset@font\undeffmt{#1}}}
  {\patchsuccess{\@setcpageref}}
  {\patchfailure{\@setcpageref}}

\patchcmd{\@setcpagerefrange}%
  {\nfss@text{\reset@font\bfseries ??}}%
  {\nfss@text{\reset@font\undeffmt{#1}}}
  {\patchsuccess{\@setcpagerefrange}}
  {\patchfailure{\@setcpagerefrange}}
\patchcmd{\@setcpagerefrange}%
  {\nfss@text{\reset@font\bfseries ??}}%
  {\nfss@text{\reset@font\undeffmt{#2}}}
  {\patchsuccess{\@setcpagerefrange}}
  {\patchfailure{\@setcpagerefrange}}
\patchcmd{\@setcpagerefrange}%
  {\nfss@text{\reset@font\bfseries ??}}%
  {\nfss@text{\reset@font\undeffmt{#1}}}
  {\patchsuccess{\@setcpagerefrange}}
  {\patchfailure{\@setcpagerefrange}}
\patchcmd{\@setcpagerefrange}%
  {\nfss@text{\reset@font\bfseries ??}}%
  {\nfss@text{\reset@font\undeffmt{#2}}}
  {\patchsuccess{\@setcpagerefrange}}
  {\patchfailure{\@setcpagerefrange}}

\makeatother

\fi