diff --git a/libc/include/stdlib.h b/libc/include/stdlib.h
index 195765a..857d631 100644
--- a/libc/include/stdlib.h
+++ b/libc/include/stdlib.h
@@ -120,18 +120,12 @@
 char* setstate(char*);
 void srandom(unsigned int);
 
-/* Basic PTY functions.  These only work if devpts is mounted! */
-
-extern int    unlockpt(int);
-extern char*  ptsname(int);
-extern int    ptsname_r(int, char*, size_t);
-extern int    getpt(void);
-
-static __inline__ int grantpt(int __fd __attribute((unused)))
-{
-  (void)__fd;
-  return 0;     /* devpts does this all for us! */
-}
+int getpt(void);
+int grantpt(int);
+int posix_openpt(int);
+char* ptsname(int) __warnattr("ptsname is not thread-safe; use ptsname_r instead");
+int ptsname_r(int, char*, size_t);
+int unlockpt(int);
 
 typedef struct {
     int  quot;
diff --git a/libc/include/unistd.h b/libc/include/unistd.h
index 12e6257..82c53e8 100644
--- a/libc/include/unistd.h
+++ b/libc/include/unistd.h
@@ -170,7 +170,7 @@
 extern int optind, opterr, optopt;
 
 extern int isatty(int);
-extern char* ttyname(int);
+extern char* ttyname(int) __warnattr("ttyname is not thread-safe; use ttyname_r instead");
 extern int ttyname_r(int, char*, size_t);
 
 extern int  acct(const char*  filepath);