diff --git a/libc/include/sys/msg.h b/libc/include/sys/msg.h
index f746bb5..ced5a3e 100644
--- a/libc/include/sys/msg.h
+++ b/libc/include/sys/msg.h
@@ -41,10 +41,10 @@
 typedef __kernel_ulong_t msgqnum_t;
 typedef __kernel_ulong_t msglen_t;
 
-int msgctl(int, int, struct msqid_ds*) __INTRODUCED_IN_FUTURE;
-int msgget(key_t, int) __INTRODUCED_IN_FUTURE;
-ssize_t msgrcv(int, void*, size_t, long, int) __INTRODUCED_IN_FUTURE;
-int msgsnd(int, const void*, size_t, int) __INTRODUCED_IN_FUTURE;
+int msgctl(int, int, struct msqid_ds*) __INTRODUCED_IN(26);
+int msgget(key_t, int) __INTRODUCED_IN(26);
+ssize_t msgrcv(int, void*, size_t, long, int) __INTRODUCED_IN(26);
+int msgsnd(int, const void*, size_t, int) __INTRODUCED_IN(26);
 
 __END_DECLS
 
diff --git a/libc/include/sys/quota.h b/libc/include/sys/quota.h
index 08ca982..51f7675 100644
--- a/libc/include/sys/quota.h
+++ b/libc/include/sys/quota.h
@@ -40,7 +40,7 @@
 
 __BEGIN_DECLS
 
-int quotactl(int, const char*, int, char*) __INTRODUCED_IN_FUTURE;
+int quotactl(int, const char*, int, char*) __INTRODUCED_IN(26);
 
 __END_DECLS
 
diff --git a/libc/include/sys/sem.h b/libc/include/sys/sem.h
index 99873c1..904c334 100644
--- a/libc/include/sys/sem.h
+++ b/libc/include/sys/sem.h
@@ -43,12 +43,12 @@
 
 __BEGIN_DECLS
 
-int semctl(int, int, int, ...) __INTRODUCED_IN_FUTURE;
-int semget(key_t, int, int) __INTRODUCED_IN_FUTURE;
-int semop(int, struct sembuf*, size_t) __INTRODUCED_IN_FUTURE;
+int semctl(int, int, int, ...) __INTRODUCED_IN(26);
+int semget(key_t, int, int) __INTRODUCED_IN(26);
+int semop(int, struct sembuf*, size_t) __INTRODUCED_IN(26);
 
 #if defined(__USE_GNU)
-int semtimedop(int, struct sembuf*, size_t, const struct timespec*) __INTRODUCED_IN_FUTURE;
+int semtimedop(int, struct sembuf*, size_t, const struct timespec*) __INTRODUCED_IN(26);
 #endif
 
 __END_DECLS
diff --git a/libc/include/sys/shm.h b/libc/include/sys/shm.h
index 7836460..ccd3b36 100644
--- a/libc/include/sys/shm.h
+++ b/libc/include/sys/shm.h
@@ -42,10 +42,10 @@
 
 typedef unsigned long shmatt_t;
 
-void* shmat(int, const void*, int) __INTRODUCED_IN_FUTURE;
-int shmctl(int, int, struct shmid_ds*) __INTRODUCED_IN_FUTURE;
-int shmdt(const void*) __INTRODUCED_IN_FUTURE;
-int shmget(key_t, size_t, int) __INTRODUCED_IN_FUTURE;
+void* shmat(int, const void*, int) __INTRODUCED_IN(26);
+int shmctl(int, int, struct shmid_ds*) __INTRODUCED_IN(26);
+int shmdt(const void*) __INTRODUCED_IN(26);
+int shmget(key_t, size_t, int) __INTRODUCED_IN(26);
 
 __END_DECLS
 
diff --git a/libc/include/sys/socket.h b/libc/include/sys/socket.h
index c87465f..2dc54aa 100644
--- a/libc/include/sys/socket.h
+++ b/libc/include/sys/socket.h
@@ -326,7 +326,7 @@
         socklen_t*) __overloadable __RENAME_CLANG(recvfrom);
 
 extern ssize_t __sendto_chk(int, const void*, size_t, size_t, int, const struct sockaddr*,
-        socklen_t) __INTRODUCED_IN_FUTURE;
+        socklen_t) __INTRODUCED_IN(26);
 ssize_t __recvfrom_chk(int, void*, size_t, size_t, int, struct sockaddr*,
         socklen_t*) __INTRODUCED_IN(21);
 
diff --git a/libc/include/sys/system_properties.h b/libc/include/sys/system_properties.h
index c0bd445..d075859 100644
--- a/libc/include/sys/system_properties.h
+++ b/libc/include/sys/system_properties.h
@@ -58,7 +58,7 @@
  */
 void __system_property_read_callback(const prop_info *pi,
     void (*callback)(void* cookie, const char *name, const char *value, uint32_t serial),
-    void* cookie) __INTRODUCED_IN_FUTURE;
+    void* cookie) __INTRODUCED_IN(26);
 
 /*
  * Passes a `prop_info` for each system property to the provided
@@ -86,7 +86,7 @@
                             uint32_t old_serial,
                             uint32_t* new_serial_ptr,
                             const struct timespec* relative_timeout)
-    __INTRODUCED_IN_FUTURE;
+    __INTRODUCED_IN(26);
 
 /* Deprecated. In Android O and above, there's no limit on property name length. */
 #define PROP_NAME_MAX   32
diff --git a/libc/include/sys/time.h b/libc/include/sys/time.h
index ad5844a..4d477e1 100644
--- a/libc/include/sys/time.h
+++ b/libc/include/sys/time.h
@@ -47,12 +47,12 @@
 int utimes(const char*, const struct timeval*);
 
 #if defined(__USE_BSD)
-int futimes(int, const struct timeval[2]) __INTRODUCED_IN_FUTURE;
-int lutimes(const char*, const struct timeval[2]) __INTRODUCED_IN_FUTURE;
+int futimes(int, const struct timeval[2]) __INTRODUCED_IN(26);
+int lutimes(const char*, const struct timeval[2]) __INTRODUCED_IN(26);
 #endif
 
 #if defined(__USE_GNU)
-int futimesat(int, const char*, const struct timeval[2]) __INTRODUCED_IN_FUTURE;
+int futimesat(int, const char*, const struct timeval[2]) __INTRODUCED_IN(26);
 #endif
 
 #define timerclear(a)   \