A few fixes (Koppi). See https://groups.google.com/a/webmproject.org/group/codec-devel/msg/3632b982d5e03b3d?hl=en

Change-Id: Ia257d07ae00555a129a5d3e8d81309707a569f23
modified:   webm-contributor-guide.html
modified:   webm-contributor-guide.txt
diff --git a/webm-contributor-guide.html b/webm-contributor-guide.html
index 4a5f038..d1d7e7d 100644
--- a/webm-contributor-guide.html
+++ b/webm-contributor-guide.html
@@ -248,8 +248,12 @@
 
 <ol>
   <li>
-    <p>To get started, <strong>clone the libvpx repository</strong>. After cloning, 
-you&rsquo;ll be working in the master branch by default.</p>
+    <p>To get started, ensure that your system satisfies the <strong><a href="http://www.webmproject.org/code/build-prerequisites/">build 
+prerequisites</a></strong>.</p>
+  </li>
+  <li>
+    <p>Next, <strong>clone the libvpx repository</strong>. After cloning, you&rsquo;ll be 
+working in the master branch by default.</p>
 
     <pre><code>$ git clone git://review.webmproject.org/libvpx.git
 $ cd libvpx
@@ -277,12 +281,16 @@
 
     <pre><code>$ ./configure --help
 </code></pre>
+
+    <p>There are several ways to &ldquo;install&rdquo; (<code>make install</code>, etc.), so 
+we&rsquo;ll leave that up to you.  Just ensure that the VP8 encoder 
+(<code>vpxenc</code>) is executable and in your $PATH.</p>
   </li>
   <li>
     <p><strong>Run some encodes</strong> using the provided scripts.  Example:</p>
 
     <pre><code>$ cd &lt;test clip directory&gt;
-$ ./run_tests 200 500 50 baseline
+$ run_tests 200 500 50 baseline
 </code></pre>
 
     <p>In this example, <code>run_tests</code> will encode each <code>y4m</code> file in the 
@@ -300,7 +308,7 @@
     <p><strong>Make your changes to libvpx</strong>, rebuild, and re-run the tests 
 using a different output directory name. Example:</p>
 
-    <pre><code>$ ./run_tests 200 500 50 mytweak
+    <pre><code>$ run_tests 200 500 50 mytweak
 </code></pre>
 
     <p>Alternatively, change the parameters in the batch encoder script 
@@ -310,7 +318,7 @@
     <p>When the tests are finished, run <code>visual_metrics.py</code> to generate 
 an <strong>HTML-format report</strong> that compares <code>mytweak</code> with <code>baseline</code>.</p>
 
-    <pre><code>$ ./visual_metrics.py . baseline mytweak &gt; mytweak.html
+    <pre><code>$ visual_metrics.py . baseline mytweak &gt; mytweak.html
 </code></pre>
   </li>
   <li>
diff --git a/webm-contributor-guide.txt b/webm-contributor-guide.txt
index 73bce43..670ea1c 100644
--- a/webm-contributor-guide.txt
+++ b/webm-contributor-guide.txt
@@ -108,8 +108,11 @@
 Download, Build and Test libvpx
 -------------------------------
 
-  1. To get started, **clone the libvpx repository**. After cloning, 
-     you'll be working in the master branch by default.
+  1. To get started, ensure that your system satisfies the **[build 
+     prerequisites](http://www.webmproject.org/code/build-prerequisites/)**.
+
+  2. Next, **clone the libvpx repository**. After cloning, you'll be 
+     working in the master branch by default.
 
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      $ git clone git://review.webmproject.org/libvpx.git
@@ -126,7 +129,7 @@
      $ git checkout experimental
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-  2. **Configure and build libvpx.** Be sure to run the configure 
+  3. **Configure and build libvpx.** Be sure to run the configure 
      script with `--enable-psnr`, which causes the encoder (`vpxenc`) 
      to output statistical data as well as a video file. For example:
 
@@ -141,11 +144,15 @@
      $ ./configure --help
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      
-  3. **Run some encodes** using the provided scripts.  Example:
+     There are several ways to "install" (`make install`, etc.), so 
+     we'll leave that up to you.  Just ensure that the VP8 encoder 
+     (`vpxenc`) is executable and in your $PATH.
+     
+  4. **Run some encodes** using the provided scripts.  Example:
 
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      $ cd <test clip directory>
-     $ ./run_tests 200 500 50 baseline
+     $ run_tests 200 500 50 baseline
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      
      In this example, `run_tests` will encode each `y4m` file in the 
@@ -159,24 +166,24 @@
      for each input file, and will be reused on subsequent 2-pass 
      encodes if not deleted.
 
-  4. **Make your changes to libvpx**, rebuild, and re-run the tests 
+  5. **Make your changes to libvpx**, rebuild, and re-run the tests 
      using a different output directory name. Example:
 
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-     $ ./run_tests 200 500 50 mytweak
+     $ run_tests 200 500 50 mytweak
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
      Alternatively, change the parameters in the batch encoder script 
      (`be`) that's called by `run_tests`. `be` in turn calls `vpxenc`. 
      
-  5. When the tests are finished, run `visual_metrics.py` to generate 
+  6. When the tests are finished, run `visual_metrics.py` to generate 
      an **HTML-format report** that compares `mytweak` with `baseline`.
 
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-     $ ./visual_metrics.py . baseline mytweak > mytweak.html
+     $ visual_metrics.py . baseline mytweak > mytweak.html
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-  6. **View the report** by opening `mytweak.html` in a web browser.
+  7. **View the report** by opening `mytweak.html` in a web browser.
 
 
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