doc: add README-prereq, referenced from README-hacking

* README-prereq: New file.  Cloned from coreutils, s/coreutils/grep/
Reported by Tony Abou-Assaleh.

1 files changed, 61 insertions, 0 deletions

diff --git a/README-prereq b/README-prereq
new file mode 100644
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--- /dev/null
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+This gives some notes on obtaining the tools required for development.
+I.E. the tools checked for by the bootstrap script and include:
+
+- Autoconf  <http://www.gnu.org/software/autoconf/>
+- Automake  <http://www.gnu.org/software/automake/>
+- Bison     <http://www.gnu.org/software/bison/>
+- Gettext   <http://www.gnu.org/software/gettext/>
+- Git       <http://git.or.cz/>
+- Gperf     <http://www.gnu.org/software/gperf/>
+- Gzip      <http://www.gnu.org/software/gzip/>
+- Perl      <http://www.cpan.org/>
+- Rsync     <http://samba.anu.edu.au/rsync/>
+- Tar       <http://www.gnu.org/software/tar/>
+- Texinfo   <http://www.gnu.org/software/texinfo/>
+
+Note please try to install/build official packages for your system.
+If these programs are not available use the following instructions
+to build them and install the results into a directory that you will
+then use when building this package.
+
+Even if the official version of a package for your system is too old,
+please install it, as it may be required to build the newer versions.
+The examples below install into $HOME/grep/deps/, so if you are
+going to follow these instructions, first ensure that your $PATH is
+set correctly by running this command:
+
+  prefix=$HOME/grep/deps
+  export PATH=$prefix/bin:$PATH
+
+* autoconf *
+
+  # Note Autoconf 2.62 or newer is needed to build automake-1.11.1
+  git clone --depth=1 git://git.sv.gnu.org/autoconf.git
+  git checkout v2.62
+  autoreconf -vi
+  ./configure --prefix=$prefix
+  make install
+
+* automake *
+
+  # Note help2man is required to build automake fully
+  git clone git://git.sv.gnu.org/automake.git
+  cd automake
+  git checkout v1.11.1
+  ./bootstrap
+  ./configure --prefix=$prefix
+  make install
+
+This package uses XZ utils (successor to LZMA) to create
+a compressed distribution tarball.  Using this feature of Automake
+requires version 1.10a or newer, as well as the xz program itself.
+
+* xz *
+
+  git clone git://ctrl.tukaani.org/xz.git
+  cd xz
+  ./autogen.sh
+  ./configure --prefix=$prefix
+  make install
+
+Now you can build this package as described in README-hacking.