cc -pipe -O   -pthread  -Wall -Wextra -Werror=implicit-function-declaration stdlib/secure_getenv.c -o stdlib/secure_getenv -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread -lrt  -lrt -lcrypt
stdlib/secure_getenv.c: In function 'main':
stdlib/secure_getenv.c:12:22: error: implicit declaration of function 'secure_getenv' [-Werror=implicit-function-declaration]
  const char* value = secure_getenv("FOO");
                      ^~~~~~~~~~~~~
stdlib/secure_getenv.c:12:22: warning: initialization of 'const char *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
cc1: some warnings being treated as errors