Found the following significant warnings:
  stable.h:182:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable.h:185:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable.h:188:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable.h:191:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable.h:194:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable.h:197:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable.h:200:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable.h:203:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable.h:206:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable.h:209:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable.h:212:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable.h:215:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable.h:218:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable.h:221:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable_dist.c:40:14: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable_dist.c:67:5: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable_dist.c:69:5: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable_dist.c:71:5: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable_dist.c:74:14: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable_dist.c:77:14: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable_dist.c:80:8: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable_dist.c:101:8: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable_dist.c:111:8: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable_dist.c:116:8: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable_dist.c:120:8: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable_dist.c:124:8: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable_dist.c:128:8: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  stable_dist.c:136:8: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
See ‘/home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/libstableR.Rcheck/00install.out’ for details.
* used C compiler: ‘gcc-12 (Debian 12.2.0-14) 12.2.0’
* used C++ compiler: ‘g++-12 (Debian 12.2.0-14) 12.2.0’