basically none of these build
diff --git a/src/libauth/noworld.c b/src/libauth/noworld.c
new file mode 100644
index 0000000..c61b146
--- /dev/null
+++ b/src/libauth/noworld.c
@@ -0,0 +1,45 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <auth.h>
+
+/*
+ * see if user is in the group noworld, i.e., has all file
+ * priviledges masked with 770, and all directories with
+ * 771, before checking access rights
+ */
+int
+noworld(char *user)
+{
+ Biobuf *b;
+ char *p;
+ int n;
+
+ b = Bopen("/adm/users", OREAD);
+ if(b == nil)
+ return 0;
+ while((p = Brdline(b, '\n')) != nil){
+ p[Blinelen(b)-1] = 0;
+ p = strchr(p, ':');
+ if(p == nil)
+ continue;
+ if(strncmp(p, ":noworld:", 9) == 0){
+ p += 9;
+ break;
+ }
+ }
+ n = strlen(user);
+ while(p != nil && *p != 0){
+ p = strstr(p, user);
+ if(p == nil)
+ break;
+ if(*(p-1) == ':' || *(p-1) == ',')
+ if(*(p+n) == ':' || *(p+n) == ',' || *(p+n) == 0){
+ Bterm(b);
+ return 1;
+ }
+ p++;
+ }
+ Bterm(b);
+ return 0;
+}
