possible fortify errors

builds

deps/strdup/strdup.h:22:1: error: expected identifier or '(' before '__extension__'
 strdup(const char *str);

strsep.c:65:23: error: register name not specified for 'delim'
  register const char *delim;

installwatch.c:3751:5: error: conflicting types for '__open_2'
 int __open_2(const char *pathname, int flags, ...) {

/nix/store/88633npw9w7xs4ixyl4sc85bqls8r21d-glibc-2.23-dev/include/bits/fcntl2.h:50:4: error: call to '__open_missing_mode' declared with attribute error: open with O_CREAT or O_TMPFILE in second argument needs 3 arguments
    __open_missing_mode ();