diff --git a/libc/include/sys/sysconf.h b/libc/include/sys/sysconf.h
new file mode 100644
index 0000000..2fc1b08
--- /dev/null
+++ b/libc/include/sys/sysconf.h
@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#ifndef _SYS_SYSCONF_H_
+#define _SYS_SYSCONF_H_
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+/* as listed by Posix sysconf() description */
+/* most of these will return -1 and ENOSYS  */
+
+#define _SC_ARG_MAX             0x0000
+#define _SC_BC_BASE_MAX         0x0001
+#define _SC_BC_DIM_MAX          0x0002
+#define _SC_BC_SCALE_MAX        0x0003
+#define _SC_BC_STRING_MAX       0x0004
+#define _SC_CHILD_MAX           0x0005
+#define _SC_CLK_TCK             0x0006
+#define _SC_COLL_WEIGHTS_MAX    0x0007
+#define _SC_EXPR_NEST_MAX       0x0008
+#define _SC_LINE_MAX            0x0009
+#define _SC_NGROUPS_MAX         0x000a
+#define _SC_OPEN_MAX            0x000b
+#define _SC_PASS_MAX            0x000c
+#define _SC_2_C_BIND            0x000d
+#define _SC_2_C_DEV             0x000e
+#define _SC_2_C_VERSION         0x000f
+#define _SC_2_CHAR_TERM         0x0010
+#define _SC_2_FORT_DEV          0x0011
+#define _SC_2_FORT_RUN          0x0012
+#define _SC_2_LOCALEDEF         0x0013
+#define _SC_2_SW_DEV            0x0014
+#define _SC_2_UPE               0x0015
+#define _SC_2_VERSION           0x0016
+#define _SC_JOB_CONTROL         0x0017
+#define _SC_SAVED_IDS           0x0018
+#define _SC_VERSION             0x0019
+#define _SC_RE_DUP_MAX          0x001a
+#define _SC_STREAM_MAX          0x001b
+#define _SC_TZNAME_MAX          0x001c
+#define _SC_XOPEN_CRYPT         0x001d
+#define _SC_XOPEN_ENH_I18N      0x001e
+#define _SC_XOPEN_SHM           0x001f
+#define _SC_XOPEN_VERSION       0x0020
+#define _SC_XOPEN_XCU_VERSION   0x0021
+#define _SC_XOPEN_REALTIME      0x0022
+#define _SC_XOPEN_REALTIME_THREADS  0x0023
+#define _SC_XOPEN_LEGACY        0x0024
+#define _SC_ATEXIT_MAX          0x0025
+#define _SC_IOV_MAX             0x0026
+#define _SC_PAGESIZE            0x0027
+#define _SC_PAGE_SIZE           0x0028
+#define _SC_XOPEN_UNIX          0x0029
+#define _SC_XBS5_ILP32_OFF32    0x002a
+#define _SC_XBS5_ILP32_OFFBIG   0x002b
+#define _SC_XBS5_LP64_OFF64     0x002c
+#define _SC_XBS5_LPBIG_OFFBIG   0x002d
+#define _SC_AIO_LISTIO_MAX      0x002e
+#define _SC_AIO_MAX             0x002f
+#define _SC_AIO_PRIO_DELTA_MAX  0x0030
+#define _SC_DELAYTIMER_MAX      0x0031
+#define _SC_MQ_OPEN_MAX         0x0032
+#define _SC_MQ_PRIO_MAX         0x0033
+#define _SC_RTSIG_MAX           0x0034
+#define _SC_SEM_NSEMS_MAX       0x0035
+#define _SC_SEM_VALUE_MAX       0x0036
+#define _SC_SIGQUEUE_MAX        0x0037
+#define _SC_TIMER_MAX           0x0038
+#define _SC_ASYNCHRONOUS_IO     0x0039
+#define _SC_FSYNC               0x003a
+#define _SC_MAPPED_FILES        0x003b
+#define _SC_MEMLOCK             0x003c
+#define _SC_MEMLOCK_RANGE       0x003d
+#define _SC_MEMORY_PROTECTION   0x003e
+#define _SC_MESSAGE_PASSING     0x003f
+#define _SC_PRIORITIZED_IO      0x0040
+#define _SC_PRIORITY_SCHEDULING 0x0041
+#define _SC_REALTIME_SIGNALS    0x0042
+#define _SC_SEMAPHORES          0x0043
+#define _SC_SHARED_MEMORY_OBJECTS  0x0044
+#define _SC_SYNCHRONIZED_IO     0x0045
+#define _SC_TIMERS              0x0046
+#define _SC_GETGR_R_SIZE_MAX    0x0047
+#define _SC_GETPW_R_SIZE_MAX    0x0048
+#define _SC_LOGIN_NAME_MAX      0x0049
+#define _SC_THREAD_DESTRUCTOR_ITERATIONS  0x004a
+#define _SC_THREAD_KEYS_MAX     0x004b
+#define _SC_THREAD_STACK_MIN    0x004c
+#define _SC_THREAD_THREADS_MAX  0x004d
+#define _SC_TTY_NAME_MAX        0x004e
+
+#define _SC_THREADS                     0x004f
+#define _SC_THREAD_ATTR_STACKADDR       0x0050
+#define _SC_THREAD_ATTR_STACKSIZE       0x0051
+#define _SC_THREAD_PRIORITY_SCHEDULING  0x0052
+#define _SC_THREAD_PRIO_INHERIT         0x0053
+#define _SC_THREAD_PRIO_PROTECT         0x0054
+#define _SC_THREAD_SAFE_FUNCTIONS       0x0055
+
+#define _SC_NPROCESSORS_CONF            0x0060
+#define _SC_NPROCESSORS_ONLN            0x0061
+#define _SC_PHYS_PAGES                  0x0062
+#define _SC_AVPHYS_PAGES                0x0063
+
+extern int sysconf (int  name);
+
+__END_DECLS
+
+#endif /* _SYS_SYSCONF_H_ */