Reported downstream at https://bugs.gentoo.org/show_bug.cgi?id=550758

When attempting to build old udisks-1.0.5 on a glibc-2.20 system:


job-drive-detach.c: In function ‘sysfs_exists’:
job-drive-detach.c:44:15: error: storage size of ‘statbuf’ isn’t known
   struct stat statbuf;
               ^
job-drive-detach.c:51:7: warning: implicit declaration of function ‘stat’ [-Wimplicit-function-declaration]
   if (stat (s, &statbuf) == 0)
       ^
job-drive-detach.c:51:3: warning: nested extern declaration of ‘stat’ [-Wnested-externs]
   if (stat (s, &statbuf) == 0)
   ^
job-drive-detach.c:44:15: warning: unused variable ‘statbuf’ [-Wunused-variable]
   struct stat statbuf;
               ^
job-drive-detach.c: In function ‘main’:
job-drive-detach.c:110:15: error: storage size of ‘statbuf’ isn’t known
   struct stat statbuf;
               ^
job-drive-detach.c:110:15: warning: unused variable ‘statbuf’ [-Wunused-variable]
Makefile:901: recipe for target 'udisks_helper_drive_detach-job-drive-detach.o' failed