x86_64-managarm-gcc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations threads/ONCE_FLAG_INIT.c -o threads/ONCE_FLAG_INIT -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
threads/ONCE_FLAG_INIT.c:3:2: error: #error "ONCE_FLAG_INIT is not defined"
    3 | #error "ONCE_FLAG_INIT is not defined"
      |  ^~~~~