title: Building valide: Package libvala-0.12 was not found in the pkg-config search path
body: <p>I am trying to build the latest version of <a href="https://launchpad.net/valide" rel="nofollow">valide</a> (0.7.1)</p>
  
  <p>I have successfully built VALA (v 0.17.0) on my machine (Ubuntu 10.0.4 LTS). When I run </p>
  
  <p><code>./waf configure</code> in the valide src directory, I get the following output:</p>
  
  <pre><code>Checking for program gcc or cc           : /usr/bin/gcc 
  Checking for program cpp                 : /usr/bin/cpp 
  Checking for program ar                  : /usr/bin/ar 
  Checking for program ranlib              : /usr/bin/ranlib 
  Checking for gcc                         : ok  
  Checking for program valac               : /usr/local/bin/valac 
  Checking for gobject-2.0                 : yes 
  Checking for gthread-2.0                 : yes 
  Checking for program version valac &gt;= 0.1.6 : ok 0.17.0 
  Checking for program msgfmt                 : /usr/bin/msgfmt 
  Checking for program intltool-merge         : /usr/bin/intltool-merge 
  Checking for header locale.h                : yes 
  Checking for program valadoc                : not found 
  Checking for glib-2.0 &gt;= 2.18.0             : yes 
  Checking for gio-2.0 &gt;= 2.18.0              : yes 
  Checking for gobject-2.0 &gt;= 2.18.0          : yes 
  Checking for gmodule-2.0 &gt;= 2.18.0          : yes 
  Checking for gtk+-2.0 &gt;= 2.18.0             : yes 
  Checking for libxml-2.0 &gt;= 2.5.0            : yes 
  Checking for gtksourceview-2.0 &gt;= 2.10.0    : yes 
  Checking for libvala-0.12 &gt;= 0.12.0         : Package libvala-0.12 was not found in the pkg-config search path.
  Perhaps you should add the directory containing `libvala-0.12.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'libvala-0.12' found 
  
  /path/to/valide-0.7.1/wscript:53: error: the configuration failed (see '/path/to/valide-0.7.1/_build_/config.log')
  </code></pre>
  
  <p>I checked for the relevant .pc files on my system</p>
  
  <pre><code>me@yourbox:~/path/to/valide-0.7.1$ find ../vala/ -name 'libvala*.pc' -type f
  ../vala/vala-0.17.0/libvala-0.18.pc
  ../vala/vala-0.17.0/libvala.pc
  </code></pre>
  
  <p>I then exported the relevant ENV VAR as follows:</p>
  
  <pre><code>export PKG_CONFIG_PATH=/path/to/vala/vala-0.17.0
  </code></pre>
  
  <p>I then run <code>./waf configure</code>. To my dismay, I got exactly the same output as posted earlier.</p>
  
  <p>What do I need to fix to build valide on Ubuntu 10.0.4 LTS?</p>