launch.c: In function 'guestfs_int_unblock_sigterm':
launch.c:176:3: warning: implicit declaration of function 'sigemptyset' [-Wimplicit-function-declaration]
   sigemptyset (&sigset);
   ^
launch.c:176:3: warning: nested extern declaration of 'sigemptyset' [-Wnested-externs]
launch.c:177:3: warning: implicit declaration of function 'sigaddset' [-Wimplicit-function-declaration]
   sigaddset (&sigset, SIGTERM);
   ^
launch.c:177:3: warning: nested extern declaration of 'sigaddset' [-Wnested-externs]
launch.c:177:23: error: 'SIGTERM' undeclared (first use in this function)
   sigaddset (&sigset, SIGTERM);
                       ^
launch.c:177:23: note: each undeclared identifier is reported only once for each function it appears in
launch.c:178:3: warning: implicit declaration of function 'sigprocmask' [-Wimplicit-function-declaration]
   sigprocmask (SIG_UNBLOCK, &sigset, NULL);
   ^
launch.c:178:3: warning: nested extern declaration of 'sigprocmask' [-Wnested-externs]
launch.c:178:16: error: 'SIG_UNBLOCK' undeclared (first use in this function)
   sigprocmask (SIG_UNBLOCK, &sigset, NULL);