cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations langinfo/ALTMON_5.c -o langinfo/ALTMON_5 -D_POSIX_C_SOURCE=202405L  -lm -lpthread  -liconv
langinfo/ALTMON_5.c:2:17: error: use of undeclared identifier 'ALTMON_5'
    2 | int const foo = ALTMON_5;
      |                 ^
1 error generated.