diff --git a/libc/config/linux/x86_64/headers.txt b/libc/config/linux/x86_64/headers.txt
--- a/libc/config/linux/x86_64/headers.txt
+++ b/libc/config/linux/x86_64/headers.txt
@@ -10,6 +10,7 @@
     libc.include.pthread
     libc.include.sched
     libc.include.signal
+    libc.include.spawn
     libc.include.stdio
     libc.include.stdlib
     libc.include.string
@@ -17,12 +18,15 @@
     libc.include.time
     libc.include.unistd
 
+    libc.include.sys_auxv
     libc.include.sys_ioctl
     libc.include.sys_mman
+    libc.include.sys_prctl
     libc.include.sys_random
     libc.include.sys_resource
     libc.include.sys_stat
     libc.include.sys_syscall
+    libc.include.sys_time
     libc.include.sys_utsname
     libc.include.sys_wait
 )
diff --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
--- a/libc/include/CMakeLists.txt
+++ b/libc/include/CMakeLists.txt
@@ -228,6 +228,15 @@
 # them.
 file(MAKE_DIRECTORY "sys")
 
+add_gen_header(
+  sys_auxv
+  DEF_FILE sys/auxv.h.def
+  GEN_HDR sys/auxv.h
+  DEPENDS
+    .llvm_libc_common_h
+    .llvm-libc-macros.sys_auxv_macros
+)
+
 add_gen_header(
   sys_ioctl
   DEF_FILE sys/ioctl.h.def
@@ -248,6 +257,14 @@
     .llvm-libc-macros.sys_mman_macros
 )
 
+add_gen_header(
+  sys_prctl
+  DEF_FILE sys/prctl.h.def
+  GEN_HDR sys/prctl.h
+  DEPENDS
+    .llvm_libc_common_h
+)
+
 add_gen_header(
   sys_random
   DEF_FILE sys/random.h.def
@@ -301,6 +318,16 @@
     ../config/${LIBC_TARGET_OS}/syscall_numbers.h.inc
 )
 
+add_gen_header(
+  sys_time
+  DEF_FILE sys/time.h.def
+  GEN_HDR sys/time.h
+  DEPENDS
+    .llvm_libc_common_h
+    .llvm-libc-types.struct_timeval
+    .llvm-libc-macros.sys_time_macros
+)
+
 add_gen_header(
   sys_utsname
   DEF_FILE sys/utsname.h.def
diff --git a/libc/include/llvm-libc-macros/CMakeLists.txt b/libc/include/llvm-libc-macros/CMakeLists.txt
--- a/libc/include/llvm-libc-macros/CMakeLists.txt
+++ b/libc/include/llvm-libc-macros/CMakeLists.txt
@@ -36,6 +36,12 @@
     stdlib-macros.h
 )
 
+add_header(
+  sys_auxv_macros
+  HDR
+    sys-auxv-macros.h
+)
+
 add_header(
   sys_ioctl_macros
   HDR
@@ -77,6 +83,14 @@
     .linux.sys_resource_macros
 )
 
+add_header(
+  sys_time_macros
+  HDR
+    sys-time-macros.h
+  DEPENDS
+    .linux.sys_time_macros
+)
+
 add_header(
   sys_wait_macros
   HDR
diff --git a/libc/include/llvm-libc-macros/linux/CMakeLists.txt b/libc/include/llvm-libc-macros/linux/CMakeLists.txt
--- a/libc/include/llvm-libc-macros/linux/CMakeLists.txt
+++ b/libc/include/llvm-libc-macros/linux/CMakeLists.txt
@@ -52,6 +52,12 @@
     sys-stat-macros.h
 )
 
+add_header(
+  sys_time_macros
+  HDR
+    sys-time-macros.h
+)
+
 add_header(
   unistd_macros
   HDR
diff --git a/libc/include/llvm-libc-macros/linux/sys-time-macros.h b/libc/include/llvm-libc-macros/linux/sys-time-macros.h
new file mode 100644
--- /dev/null
+++ b/libc/include/llvm-libc-macros/linux/sys-time-macros.h
@@ -0,0 +1,53 @@
+//===-- Definition of macros from sys/time.h ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_LIBC_MACROS_LINUX_SYS_TIME_MACROS_H
+#define __LLVM_LIBC_MACROS_LINUX_SYS_TIME_MACROS_H
+
+// Add two timevals and put the result in timeval_ptr_result. If the resulting
+// usec value is greater than 999,999 then the microseconds are turned into full
+// seconds (1,000,000 is subtracted from usec and 1 is added to sec).
+#define timeradd(timeval_ptr_a, timeval_ptr_b, timeval_ptr_result)             \
+  (timeval_ptr_result)->tv_sec =                                               \
+      (timeval_ptr_a)->tv_sec + (timeval_ptr_b)->tv_sec +                      \
+      (((timeval_ptr_a)->tv_usec + (timeval_ptr_b)->tv_usec) >= 1000000 ? 1    \
+                                                                        : 0);  \
+  (timeval_ptr_result)->tv_usec =                                              \
+      (timeval_ptr_a)->tv_usec + (timeval_ptr_b)->tv_usec -                    \
+      (((timeval_ptr_a)->tv_usec + (timeval_ptr_b)->tv_usec) >= 1000000        \
+           ? 1000000                                                           \
+           : 0);
+
+// Subtract two timevals and put the result in timeval_ptr_result. If the
+// resulting usec value is less than 0 then 1,000,000 is added to usec and 1 is
+// subtracted from sec.
+#define timersub(timeval_ptr_a, timeval_ptr_b, timeval_ptr_result)             \
+  (timeval_ptr_result)->tv_sec =                                               \
+      (timeval_ptr_a)->tv_sec - (timeval_ptr_b)->tv_sec -                      \
+      (((timeval_ptr_a)->tv_usec - (timeval_ptr_b)->tv_usec) < 0 ? 1 : 0);     \
+  (timeval_ptr_result)->tv_usec =                                              \
+      (timeval_ptr_a)->tv_usec - (timeval_ptr_b)->tv_usec +                    \
+      (((timeval_ptr_a)->tv_usec - (timeval_ptr_b)->tv_usec) < 0 ? 1000000     \
+                                                                 : 0);
+
+// Reset a timeval to the epoch.
+#define timerclear(timeval_ptr)                                                \
+  (timeval_ptr)->tv_sec = 0;                                                   \
+  (timeval_ptr)->tv_usec = 0;
+
+// Determine if a timeval is set to the epoch.
+#define timerisset(timeval_ptr)                                                \
+  (timeval_ptr)->tv_sec != 0 || (timeval_ptr)->tv_usec != 0;
+
+// Compare two timevals using CMP.
+#define timercmp(timeval_ptr_a, timeval_ptr_b, CMP)                            \
+  (((timeval_ptr_a)->tv_sec == (timeval_ptr_b)->tv_sec)                        \
+       ? ((timeval_ptr_a)->tv_usec CMP(timeval_ptr_b)->tv_usec)                \
+       : ((timeval_ptr_a)->tv_sec CMP(timeval_ptr_b)->tv_sec))
+
+#endif // __LLVM_LIBC_MACROS_LINUX_SYS_TIME_MACROS_H
diff --git a/libc/include/llvm-libc-macros/sys-auxv-macros.h b/libc/include/llvm-libc-macros/sys-auxv-macros.h
new file mode 100644
--- /dev/null
+++ b/libc/include/llvm-libc-macros/sys-auxv-macros.h
@@ -0,0 +1,43 @@
+//===-- Macros defined in sys/auxv.h header file --------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_LIBC_MACROS_AUXV_MACROS_H
+#define __LLVM_LIBC_MACROS_AUXV_MACROS_H
+
+// Macros defining the aux vector indexes.
+#define AT_NULL 0
+#define AT_IGNORE 1
+#define AT_EXECFD 2
+#define AT_PHDR 3
+#define AT_PHENT 4
+#define AT_PHNUM 5
+#define AT_PAGESZ 6
+#define AT_BASE 7
+#define AT_FLAGS 8
+#define AT_ENTRY 9
+#define AT_NOTELF 10
+#define AT_UID 11
+#define AT_EUID 12
+#define AT_GID 13
+#define AT_EGID 14
+#define AT_PLATFORM 15
+#define AT_HWCAP 16
+#define AT_CLKTCK 17
+
+#define AT_SECURE 23
+#define AT_BASE_PLATFORM 24
+#define AT_RANDOM 25
+#define AT_HWCAP2 26
+
+#define AT_EXECFN 31
+
+#ifndef AT_MINSIGSTKSZ
+#define AT_MINSIGSTKSZ 51
+#endif
+
+#endif // __LLVM_LIBC_MACROS_AUXV_MACROS_H
diff --git a/libc/include/llvm-libc-macros/sys-time-macros.h b/libc/include/llvm-libc-macros/sys-time-macros.h
new file mode 100644
--- /dev/null
+++ b/libc/include/llvm-libc-macros/sys-time-macros.h
@@ -0,0 +1,16 @@
+//===-- Macros defined in sys/time.h header file --------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_LIBC_MACROS_SYS_TIME_MACROS_H
+#define __LLVM_LIBC_MACROS_SYS_TIME_MACROS_H
+
+#ifdef __unix__
+#include "linux/sys-time-macros.h"
+#endif
+
+#endif // __LLVM_LIBC_MACROS_SYS_TIME_MACROS_H
diff --git a/libc/include/sys/auxv.h.def b/libc/include/sys/auxv.h.def
new file mode 100644
--- /dev/null
+++ b/libc/include/sys/auxv.h.def
@@ -0,0 +1,18 @@
+//===-- GNU header auxv.h -------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SYS_AUXV_H
+#define LLVM_LIBC_SYS_AUXV_H
+
+#include <__llvm-libc-common.h>
+
+#include <llvm-libc-macros/sys-auxv-macros.h>
+
+%%public_api()
+
+#endif // LLVM_LIBC_SYS_AUXV_H
diff --git a/libc/include/sys/prctl.h.def b/libc/include/sys/prctl.h.def
new file mode 100644
--- /dev/null
+++ b/libc/include/sys/prctl.h.def
@@ -0,0 +1,22 @@
+//===-- Linux header prctl.h ----------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SYS_PRCTL_H
+#define LLVM_LIBC_SYS_PRCTL_H
+
+#include <__llvm-libc-common.h>
+
+// Process control is highly platform specific, so the platform usually defines
+// the macros itself.
+#include <linux/prctl.h>
+
+// TODO: Define the prctl macros.
+
+%%public_api()
+
+#endif // LLVM_LIBC_SYS_PRCTL_H
diff --git a/libc/include/sys/time.h.def b/libc/include/sys/time.h.def
new file mode 100644
--- /dev/null
+++ b/libc/include/sys/time.h.def
@@ -0,0 +1,20 @@
+//===-- Linux header time.h -----------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SYS_TIME_H
+#define LLVM_LIBC_SYS_TIME_H
+
+#include <__llvm-libc-common.h>
+
+#include <llvm-libc-types/struct_timeval.h>
+
+#include <llvm-libc-macros/sys-time-macros.h>
+
+%%public_api()
+
+#endif // LLVM_LIBC_SYS_TIME_H
diff --git a/libc/spec/gnu_ext.td b/libc/spec/gnu_ext.td
--- a/libc/spec/gnu_ext.td
+++ b/libc/spec/gnu_ext.td
@@ -159,6 +159,14 @@
       ]
   >;
 
+  HeaderSpec SysAuxv = HeaderSpec<
+      "sys/auxv.h",
+      [], // Macros
+      [], // Types
+      [], // Enumerations
+      []  // Functions
+  >;
+
   HeaderSpec SendFile = HeaderSpec<
       "sys/sendfile.h",
       [], // Macros
@@ -194,6 +202,7 @@
     PThread,
     Sched,
     SendFile,
+    SysAuxv,
     StdIO,
     String,
     UniStd,
diff --git a/libc/spec/linux.td b/libc/spec/linux.td
--- a/libc/spec/linux.td
+++ b/libc/spec/linux.td
@@ -1,3 +1,5 @@
+def StructTimevalType : NamedType<"struct timeval">;
+
 def Linux : StandardSpec<"Linux"> {
   HeaderSpec Errno = HeaderSpec<
       "errno.h",
@@ -63,6 +65,15 @@
       [Macro<"MAP_ANONYMOUS">]
   >;
 
+
+  HeaderSpec SysPrctl = HeaderSpec<
+      "sys/prctl.h",
+      [], // Macros
+      [], // Types
+      [], // Enumerations
+      []  // Functions
+  >;
+
   HeaderSpec SysRandom = HeaderSpec<
       "sys/random.h",
       [
@@ -85,6 +96,20 @@
       ]
   >;
 
+  HeaderSpec SysTime = HeaderSpec<
+      "sys/time.h",
+      [
+        Macro<"timeradd">,
+        Macro<"timersub">,
+        Macro<"timerclear">,
+        Macro<"timerisset">,
+        Macro<"timercmp">,
+      ],
+      [StructTimevalType], // Types
+      [], // Enumerations
+      []  // Functions
+  >;
+
   HeaderSpec Signal = HeaderSpec<
       "signal.h",
       [
@@ -130,7 +155,9 @@
   let Headers = [
     Errno,
     SysMMan,
+    SysPrctl,
     SysRandom,
+    SysTime,
     Signal,
   ];
 }