clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations unistd/_SC_V7_ILP32_OFF32.c -o unistd/_SC_V7_ILP32_OFF32 -D_POSIX_C_SOURCE=202405L  -lm  -lintl
unistd/_SC_V7_ILP32_OFF32.c:3:17: error: use of undeclared identifier '_SC_V7_ILP32_OFF32'
int const foo = _SC_V7_ILP32_OFF32;
                ^
1 error generated.