x86_64-managarm-gcc -pthread   -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_types/key_t.c -o sys_types/key_t -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt  -lintl -liconv -lintl -liconv
sys_types/key_t.c:8:1: error: unknown type name ‘key_t’
    8 | key_t* foo;
      | ^~~~~