Found the following significant warnings:
  bd0.c:396:60: warning: format specifies type 'int' but the argument has type 'double' [-Wformat]
  bd0.c:396:67: warning: format specifies type 'int' but the argument has type 'R_xlen_t' (aka 'long') [-Wformat]
  bd0.c:396:72: warning: format specifies type 'double' but the argument has type 'R_xlen_t' (aka 'long') [-Wformat]
  bd0.c:433:51: warning: format specifies type 'int' but the argument has type 'R_xlen_t' (aka 'long') [-Wformat]
  bd0.c:433:56: warning: format specifies type 'int' but the argument has type 'R_xlen_t' (aka 'long') [-Wformat]
  gamma-variants.c:308:48: warning: more '%' conversions than data arguments [-Wformat-insufficient-args]
  gamma-variants.c:348:17: warning: data argument not used by format string [-Wformat-extra-args]
  gamma-variants.c:362:39: warning: format specifies type 'double' but the argument has type 'long double' [-Wformat]
  gamma-variants.c:370:39: warning: format specifies type 'double' but the argument has type 'long double' [-Wformat]
  lgammacor.c:110:27: warning: format specifies type 'double' but the argument has type 'int' [-Wformat]
  lgammacor.c:112:27: warning: format specifies type 'double' but the argument has type 'int' [-Wformat]
  pnchisq-it.c:414:39: warning: more '%' conversions than data arguments [-Wformat-insufficient-args]
  pnchisq-it.c:558:43: warning: format specifies type 'int' but the argument has type 'R_xlen_t' (aka 'long') [-Wformat]
  ppois-direct.c:146:29: warning: format specifies type 'int' but the argument has type 'R_xlen_t' (aka 'long') [-Wformat]
  ppois-direct.c:149:6: warning: format specifies type 'int' but the argument has type 'R_xlen_t' (aka 'long') [-Wformat]
  ppois-direct.c:157:40: warning: format specifies type 'int' but the argument has type 'R_xlen_t' (aka 'long') [-Wformat]
See ‘/home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/DPQ.Rcheck/00install.out’ for details.
* used C compiler: ‘Debian clang version 17.0.5 (1)’
* used Fortran compiler: ‘Debian flang-new version 17.0.5 (1)’