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+System configuration
+====================
+
+.. sectionauthor:: Travis E. Oliphant
+
+When NumPy is built, information about system configuration is
+recorded, and is made available for extension modules using NumPy's C
+API.  These are mostly defined in ``numpyconfig.h`` (included in
+``ndarrayobject.h``). The public symbols are prefixed by ``NPY_*``.
+NumPy also offers some functions for querying information about the
+platform in use.
+
+For private use, NumPy also constructs a ``config.h`` in the NumPy
+include directory, which is not exported by NumPy (that is a python
+extension which use the numpy C API will not see those symbols), to
+avoid namespace pollution.
+
+
+Data type sizes
+---------------
+
+The :c:data:`NPY_SIZEOF_{CTYPE}` constants are defined so that sizeof
+information is available to the pre-processor.
+
+.. c:var:: NPY_SIZEOF_SHORT
+
+    sizeof(short)
+
+.. c:var:: NPY_SIZEOF_INT
+
+    sizeof(int)
+
+.. c:var:: NPY_SIZEOF_LONG
+
+    sizeof(long)
+
+.. c:var:: NPY_SIZEOF_LONGLONG
+
+    sizeof(longlong) where longlong is defined appropriately on the
+    platform.
+
+.. c:var:: NPY_SIZEOF_PY_LONG_LONG
+
+
+.. c:var:: NPY_SIZEOF_FLOAT
+
+    sizeof(float)
+
+.. c:var:: NPY_SIZEOF_DOUBLE
+
+    sizeof(double)
+
+.. c:var:: NPY_SIZEOF_LONG_DOUBLE
+
+    sizeof(longdouble) (A macro defines **NPY_SIZEOF_LONGDOUBLE** as well.)
+
+.. c:var:: NPY_SIZEOF_PY_INTPTR_T
+
+    Size of a pointer on this platform (sizeof(void \*)) (A macro defines
+    NPY_SIZEOF_INTP as well.)
+
+
+Platform information
+--------------------
+
+.. c:var:: NPY_CPU_X86
+.. c:var:: NPY_CPU_AMD64
+.. c:var:: NPY_CPU_IA64
+.. c:var:: NPY_CPU_PPC
+.. c:var:: NPY_CPU_PPC64
+.. c:var:: NPY_CPU_SPARC
+.. c:var:: NPY_CPU_SPARC64
+.. c:var:: NPY_CPU_S390
+.. c:var:: NPY_CPU_PARISC
+
+    .. versionadded:: 1.3.0
+
+    CPU architecture of the platform; only one of the above is
+    defined.
+
+    Defined in ``numpy/npy_cpu.h``
+
+.. c:var:: NPY_LITTLE_ENDIAN
+
+.. c:var:: NPY_BIG_ENDIAN
+
+.. c:var:: NPY_BYTE_ORDER
+
+    .. versionadded:: 1.3.0
+
+    Portable alternatives to the ``endian.h`` macros of GNU Libc.
+    If big endian, :c:data:`NPY_BYTE_ORDER` == :c:data:`NPY_BIG_ENDIAN`, and
+    similarly for little endian architectures.
+
+    Defined in ``numpy/npy_endian.h``.
+
+.. c:function:: PyArray_GetEndianness()
+
+    .. versionadded:: 1.3.0
+
+    Returns the endianness of the current platform.
+    One of :c:data:`NPY_CPU_BIG`, :c:data:`NPY_CPU_LITTLE`,
+    or :c:data:`NPY_CPU_UNKNOWN_ENDIAN`.
+
+
+Compiler directives
+-------------------
+
+.. c:var:: NPY_LIKELY
+.. c:var:: NPY_UNLIKELY
+.. c:var:: NPY_UNUSED
+
+
+Interrupt Handling
+------------------
+
+.. c:var:: NPY_INTERRUPT_H
+.. c:var:: NPY_SIGSETJMP
+.. c:var:: NPY_SIGLONGJMP
+.. c:var:: NPY_SIGJMP_BUF
+.. c:var:: NPY_SIGINT_ON
+.. c:var:: NPY_SIGINT_OFF