Found the following significant warnings:
  agsurv3.c:66:21: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  agsurv3.c:226:12: warning: passing arguments to 'addup' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  agsurv3.c:230:12: warning: passing arguments to 'addup' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  agsurv3.c:236:8: warning: passing arguments to 'addup' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  agsurv3.c:249:9: warning: passing arguments to 'addup' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  agsurv3.c:260:13: warning: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  chinv3.c:58:6: warning: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  cox_Rcallback.c:20:6: warning: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  survreg6.c:67:20: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  survreg6.c:165:23: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  survreg6.c:207:21: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  survreg6.c:257:19: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  survreg6.c:281:18: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  survreg7.c:76:20: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  survreg7.c:244:23: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  survreg7.c:280:18: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  survreg7.c:345:16: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  survreg7.c:360:19: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  survreg7.c:391:19: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  survreg7.c:413:20: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  survregc1.c:51:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  survregc1.c:134:13: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  survregc1.c:158:13: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  survregc1.c:177:13: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  survregc1.c:198:13: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  survregc1.c:199:13: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
See '/home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/survival.Rcheck/00install.out' for details.