./compat/have_strcasestr.c:10:13: warning: call to undeclared function 'strcasestr'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    found = strcasestr (haystack, needle);
            ^
./compat/have_strcasestr.c:10:11: error: incompatible integer to pointer conversion assigning to 'char *' from 'int' [-Wint-conversion]
    found = strcasestr (haystack, needle);
          ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~




./compat/check_getpwuid.c:9:53: warning: null passed to a callee that requires a non-null argument [-Wnonnull]
    (void) getpwuid_r (0, &passwd, NULL, 0, &ignored);
                                   ~~~~             ^