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+NSPR build instructions
+=======================
+
+Prerequisites
+~~~~~~~~~~~~~
+
+On Windows, the NSPR build system needs GNU make and a Unix command-line
+utility suite such as MKS Toolkit, Cygwin, and MSYS. The easiest way to
+get these tools is to install the
+:ref:`MozillaBuild` package.
+
+Introduction
+~~~~~~~~~~~~
+
+The top level of the NSPR source tree is the ``mozilla/nsprpub``
+directory. Although ``nsprpub`` is a subdirectory under ``mozilla``,
+NSPR is independent of the Mozilla client source tree.
+
+Building NSPR consists of three steps:
+
+#. run the configure script. You may override the compilers (the CC
+   environment variable) or specify options.
+#. build the libraries
+#. build the test programs
+
+For example,
+
+::
+
+   # check out the source tree from Mercurial
+   hg clone https://hg.mozilla.org/projects/nspr
+   # create a build directory
+   mkdir target.debug
+   cd target.debug
+   # run the configure script
+   ../nspr/configure [optional configure options]
+   # build the libraries
+   gmake
+   # build the test programs
+   cd pr/tests
+   gmake
+
+On Mac OS X, use ``make``, which is GNU ``make``.
+
+.. _Configure_options:
+
+Configure options
+~~~~~~~~~~~~~~~~~
+
+Although NSPR uses autoconf, its configure script has two default values
+that are different from most open source projects.
+
+#. If the OS vendor provides a compiler (for example, Sun and HP), NSPR
+   uses that compiler instead of GCC by default.
+#. NSPR build generates a debug build by default.
+
+.. _--disable-debug_--enable-optimize:
+
+--disable-debug --enable-optimize
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Specify these two options to generate an optimized (release) build.
+
+These two options can actually be used independently, but it's not
+recommended.
+
+--enable-64bit
+^^^^^^^^^^^^^^
+
+On a dual 32-bit/64-bit platform, NSPR build generates a 32-bit build by
+default. To generate a 64-bit build, specify the ``--enable-64bit``
+configure option.
+
+.. _--targetx86_64-pc-mingw32:
+
+--target=x86_64-pc-mingw32
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+For 64-bit builds on Windows, when using the mozbuild environment.
+
+.. _--enable-win32-target.3DWIN95:
+
+--enable-win32-target=WIN95
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+This option is only used on Windows. NSPR build generates a "WINNT"
+configuration by default on Windows for historical reasons. We recommend
+most applications use the "WIN95" configuration. The "WIN95"
+configuration supports all versions of Windows. The "WIN95" name is
+historical; it should have been named "WIN32".
+
+To generate a "WIN95" configuration, specify the
+``--enable-win32-target=WIN95`` configure option.
+
+.. _--enable-debug-rtl:
+
+--enable-debug-rtl
+^^^^^^^^^^^^^^^^^^
+
+This option is only used on Windows. NSPR debug build uses the release C
+run-time library by default. To generate a debug build that uses the
+debug C run-time library, specify the ``--enable-debug-rtl`` configure
+option.
+
+.. _Makefile_targets:
+
+Makefile targets
+~~~~~~~~~~~~~~~~
+
+-  all (default)
+-  clean
+-  realclean
+-  distclean
+-  install
+-  release
+
+.. _Running_the_test_programs:
+
+Running the test programs
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The tests were built above, in the ``pr/tests`` directory.
+
+On Mac OS X, they can be executed with the following:
+
+.. code::
+
+    /bin/sh:
+
+    $ cd pr/tests
+    $ DYLD_LIBRARY_PATH=../../dist/lib ./accept
+    PASS
+    $
+    $ # to run all the NSPR tests...
+    $
+    $ DYLD_LIBRARY_PATH=../../dist/lib ../../../nspr/pr/tests/runtests.sh ../..