Found the following significant warnings:
  loessc.c:74:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  loessc.c:76:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  loessc.c:78:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  loessc.c:80:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  loessc.c:82:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  loessc.c:84:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  loessc.c:86:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  loessc.c:88:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  loessc.c:90:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  loessc.c:181:18: warning: passing arguments to 'lowesb_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:183:18: warning: passing arguments to 'lowese_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:191:18: warning: passing arguments to 'lowesf_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:199:18: warning: passing arguments to 'lowesb_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:201:18: warning: passing arguments to 'lowese_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:207:18: warning: passing arguments to 'lowesa_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:215:18: warning: passing arguments to 'lowesb_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:217:18: warning: passing arguments to 'lowese_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:221:18: warning: passing arguments to 'ehg196_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:223:18: warning: passing arguments to 'lowesa_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:231:18: warning: passing arguments to 'lowesf_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:239:18: warning: passing arguments to 'lowesa_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:249:18: warning: passing arguments to 'lowesb_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:251:18: warning: passing arguments to 'lowesl_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:253:18: warning: passing arguments to 'lowesc_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:255:18: warning: passing arguments to 'lowese_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:267:18: warning: passing arguments to 'lowesf_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:271:18: warning: passing arguments to 'lowesc_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:307:21: warning: passing arguments to 'lowesf_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:341:18: warning: passing arguments to 'lowesf_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:349:18: warning: passing arguments to 'lowesf_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:353:18: warning: passing arguments to 'lowesf_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:375:21: warning: passing arguments to 'lowese_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:405:21: warning: passing arguments to 'lowesb_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:407:21: warning: passing arguments to 'lowesl_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:461:21: warning: passing arguments to 'lowesd_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  loessc.c:639:21: warning: passing arguments to 'ehg169_' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
See ‘/data/gannet/ripley/R/packages/tests-clang/gam.Rcheck/00install.out’ for details.