Found the following significant warnings:
  fitch.c:143:28: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:143:53: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:144:31: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:148:25: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:149:32: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:149:57: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:180:23: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:180:46: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:181:43: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:185:25: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:229:28: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:229:53: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:230:31: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:234:25: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:235:32: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:235:57: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:273:23: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:274:27: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:275:31: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:276:32: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:279:42: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:283:31: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:284:32: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:287:48: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:288:60: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:291:36: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:331:23: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:333:38: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:334:28: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:384:23: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:385:27: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:386:31: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:387:32: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:390:42: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:394:31: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:395:32: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:398:48: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:399:60: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:402:36: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:446:24: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:448:28: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:449:38: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:455:50: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:457:31: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:457:54: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:476:47: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:521:24: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:523:28: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:524:38: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:530:50: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:532:31: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:532:54: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:543:45: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:582:23: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:583:26: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:591:52: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:595:75: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:656:23: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:657:26: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:665:52: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:669:75: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:875:29: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:876:32: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:926:29: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:927:32: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:977:51: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:980:38: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:986:30: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:987:30: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:1027:51: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:1030:38: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:1036:30: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  fitch.c:1037:30: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  morphy.c:1179:35: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  morphy.c:1180:57: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  morphy.c:1183:35: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  morphy.c:1212:35: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  morphy.c:1213:57: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  morphy.c:1216:35: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  statedata.c:184:20: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  statedata.c:436:20: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
  statedata.c:683:28: warning: binary integer literals are a GNU extension [-Wgnu-binary-literal]
See ‘/home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/TreeSearch.Rcheck/00install.out’ for details.