cc -O2 -pipe -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations devctl/posix_devctl.c -o devctl/posix_devctl -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lstdthreads -lcrypt
In file included from devctl/posix_devctl.c:2:
/usr/include/devctl.h:31:1: error: unknown type name '__BEGIN_DECLS'
   31 | __BEGIN_DECLS
      | ^
/usr/include/devctl.h:46:1: error: unknown type name '__END_DECLS'
   46 | __END_DECLS
      | ^
devctl/posix_devctl.c:6:38: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Werror,-Wimplicit-int]
    6 | int (*foo)(int, int, void *restrict, size_t, int *restrict) = posix_devctl;
      |                                      ^
      |                                      int
devctl/posix_devctl.c:6:63: error: use of undeclared identifier 'posix_devctl'
    6 | int (*foo)(int, int, void *restrict, size_t, int *restrict) = posix_devctl;
      |                                                               ^
4 errors generated.