diff --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
index afa90e6c8b655..81360aac984e0 100644
--- a/libc/include/CMakeLists.txt
+++ b/libc/include/CMakeLists.txt
@@ -632,8 +632,9 @@ add_header_macro(
   sys/time.h
   DEPENDS
     .llvm_libc_common_h
-    .llvm-libc-types.struct_timeval
     .llvm-libc-macros.sys_time_macros
+    .llvm-libc-types.struct_itimerval
+    .llvm-libc-types.struct_timeval
 )
 
 add_header_macro(
diff --git a/libc/include/stdio.yaml b/libc/include/stdio.yaml
index 2a0c563709984..394437ba3bbcd 100644
--- a/libc/include/stdio.yaml
+++ b/libc/include/stdio.yaml
@@ -197,12 +197,26 @@ functions:
       - type: FILE *
       - type: long
       - type: int
+  - name: fseeko
+    standards:
+      - POSIX
+    return_type: int
+    arguments:
+      - type: FILE *
+      - type: off_t
+      - type: int
   - name: ftell
     standards:
       - stdc
     return_type: long
     arguments:
       - type: FILE *
+  - name: ftello
+    standards:
+      - POSIX
+    return_type: off_t
+    arguments:
+      - type: FILE *
   - name: funlockfile
     standards:
       - POSIX