Edit $XANADU/spectral/xspec/src/makefile.xan to set the LFUNLIB variable as indicated in the line that is commented out. Now
cd $XANADU/local/spectral/xspec/src/functions xmake LIB cd $XANADU/spectral/xspec/src/model msetup alib addmod $XANBIN/lib/libxspec2.a alib mulmod $XANBIN/lib/libxspec2.a alib mixmod $XANBIN/lib/libxspec2.a mv model_* $XANADU/spectral/xspec/manager cd .. xfor xspec mv xspec.o xspec_$EXT.o xmake link xmake install