kchmviewer - ftbfs - configure: error: conditional "include_x11" was never defined.

All, With kchmviewer, the configure fails with the following: <snip> Please remember to use GNU make, often installed as gmake. Install prefix : /opt/trinity KDE support : disabled. Qt includes : Qt libraries : chmlib to link : system checking if lib should be compiled... yes checking if po should be compiled... yes checking if src should be compiled... yes checking that generated files are newer than configure... done configure: error: conditional "include_x11" was never defined. Usually this means the macro was only invoked conditionally. OK, which macro should be checked and in what file? -- David C. Rankin, J.D.,P.E.