Found the following significant warnings:
  ../inst/include/sundials/sundials_nvector.h:163:37: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ../inst/include/sundials/sundials_matrix.h:105:41: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ../inst/include/sundials/sundials_linearsolver.h:137:50: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  sundials/sundials/sundials_linearsolver.c:28:34: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  sundials/sundials/sundials_matrix.c:29:25: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ../inst/include/sundials/sundials_nonlinearsolver.h:131:56: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  sundials/sundials/sundials_nonlinearsolver.c:26:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  sundials/sundials/sundials_nvector.c:28:21: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  sundials/arkode/arkode_adapt_impl.h:125:29: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  sundials/arkode/arkode_impl.h:825:20: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  sundials/arkode/arkode.c:58:20: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  sundials/arkode/arkode_adapt.c:42:29: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
See ‘/data/gannet/ripley/R/packages/tests-clang/paropt.Rcheck/00install.out’ for details.
* used C++ compiler: ‘clang version 15.0.7’