Found the following significant warnings:
  heatapprox.c:13:6: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linScrossdist.c:31:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linScrossdist.c:34:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linSnncross.c:26:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linSnncross.c:31:15: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linSnncross.c:37:15: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linSpairdist.c:36:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linSpairdist.c:40:15: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linSpairdist.c:46:15: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  lincrossdist.c:24:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  lineardisc.c:141:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linearradius.c:24:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linequad.c:24:17: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linequad.c:25:17: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linequad.c:31:17: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linequad.c:32:17: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linknnd.c:25:15: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linknnd.h:71:3: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linknnd.c:30:15: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linnncross.c:24:15: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linnncross.c:36:15: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linnndist.c:23:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linnndist.c:102:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linpairdist.c:24:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linvdist.c:25:15: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linvdist.c:31:15: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  lintileindex.c:21:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linvknndist.c:36:6: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linvknndist.c:61:3: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  linvknndist.c:172:5: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  lixel.c:14:6: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
See ‘/data/gannet/ripley/R/packages/tests-devel/spatstat.linnet.Rcheck/00install.out’ for details.