cc -pthread   -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations regex/REG_MINIMAL.c -o regex/REG_MINIMAL -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt  -lgdbm_compat -lcrypt -latomic
regex/REG_MINIMAL.c:2:17: error: ‘REG_MINIMAL’ undeclared here (not in a function)
    2 | int const foo = REG_MINIMAL;
      |                 ^~~~~~~~~~~