Found the following significant warnings:
  opensimplex2_ctypes.h:72:1: warning: function declaration isn't a prototype [-Wstrict-prototypes]
  opensimplex2_ctypes.h:75:1: warning: function declaration isn't a prototype [-Wstrict-prototypes]
  OpenSimplex2F.c:64:8: warning: function declaration isn't a prototype [-Wstrict-prototypes]
  OpenSimplex2F.c:103:8: warning: function declaration isn't a prototype [-Wstrict-prototypes]
  OpenSimplex2F.c:167:8: warning: function declaration isn't a prototype [-Wstrict-prototypes]
  OpenSimplex2F.c:384:18: warning: function declaration isn't a prototype [-Wstrict-prototypes]
  OpenSimplex2F.c:393:18: warning: function declaration isn't a prototype [-Wstrict-prototypes]
  OpenSimplex2F.c:442:18: warning: function declaration isn't a prototype [-Wstrict-prototypes]
  OpenSimplex2F.c:653:39: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:654:31: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:655:31: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:660:39: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:661:31: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:662:31: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:669:39: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:670:31: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:671:31: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:676:39: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:677:31: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:678:31: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:685:39: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:686:31: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:687:31: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:692:39: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:693:31: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:694:31: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:706:39: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:716:32: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:755:31: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:757:39: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:760:39: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:763:39: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:766:39: warning: binary constants are a C2X feature or GCC extension
  OpenSimplex2F.c:827:17: warning: function declaration isn't a prototype [-Wstrict-prototypes]
  OpenSimplex2S.c:51:18: warning: function declaration isn't a prototype [-Wstrict-prototypes]
  OpenSimplex2S.c:111:18: warning: function declaration isn't a prototype [-Wstrict-prototypes]
  OpenSimplex2S.c:995:8: warning: function declaration isn't a prototype [-Wstrict-prototypes]
  OpenSimplex2S.c:1037:8: warning: function declaration isn't a prototype [-Wstrict-prototypes]
  OpenSimplex2S.c:1104:8: warning: function declaration isn't a prototype [-Wstrict-prototypes]
  OpenSimplex2S.c:1568:17: warning: function declaration isn't a prototype [-Wstrict-prototypes]
See 'd:/Rcompile/CRANpkg/local/4.4/opensimplex2.Rcheck/00install.out' for details.
* used C compiler: 'gcc.exe (GCC) 13.3.0'
* used C++ compiler: 'g++.exe (GCC) 13.3.0'