You must supply a makefile target:
  make ........... creates the makefiles for each subdirectory
  jspice3 ........
  nutmeg .........
  help ...........
  multidec .......
  proc2mod .......
  spiced .........
  xeditor ........
  all ............ the executables
  install ........ make and install the executables
  clean .......... remove object and executable files
  realclean ...... as above, but remove created makefiles too
  spconfig ....... the configuration file for jspice3 (spconfig.c)
  nuconfig ....... the configuration file for nutmeg (nuconfig.c)
