(from pkgsrc/emulators/simulavr)
  revision 1.20
  date: 2013/11/29 12:57:28;  author: joerg;  state: Exp;  lines: +3 -1
  Racy build.
sync (emulators/simulavr) Makefile change:
  revision 1.23
  date: 2014/06/13 03:41:46;  author: dsainty;  state: Exp;  lines: +3 -1
  If TeX is installed it is used to build a PDF.  Since we don't install the
  PDF, there's no point in building it, so disable TeX auto-detection.