x86_64-managarm-gcc -pthread  -Wall -Wextra -Werror=implicit-function-declaration spawn/posix_spawnattr_getsigmask.c -o spawn/posix_spawnattr_getsigmask -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv
spawn/posix_spawnattr_getsigmask.c: In function ‘main’:
spawn/posix_spawnattr_getsigmask.c:21:23: error: implicit declaration of function ‘posix_spawnattr_getsigmask’; did you mean ‘posix_spawnattr_setsigmask’? [-Wimplicit-function-declaration]
   21 |         if ( (errno = posix_spawnattr_getsigmask(&attr, &new_set)) )
      |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~
      |                       posix_spawnattr_setsigmask