Unable to build on Ubuntu 14.04

I have installed the dependencies. When I check vala --version, my terminal says the the version is 26.2

$vala --version Vala 0.26.2

Then I go to the build dir I created and issue cmake .. I get the following result

 -- The C compiler identification is GNU 4.8.2
 -- Check for working C compiler: /usr/bin/cc
 -- Check for working C compiler: /usr/bin/cc -- works
 -- Detecting C compiler ABI info
 -- Detecting C compiler ABI info - done
  CMake Error at CMakeLists.txt:6 (find_package):
  By not providing "FindVala.cmake" in CMAKE_MODULE_PATH this project has  
  asked CMake to find a package configuration file provided by "Vala", but
  CMake did not find one.

  Could not find a package configuration file provided by "Vala" (requested
  version 0.26) with any of the following names:

    ValaConfig.cmake
    vala-config.cmake

  Add the installation prefix of "Vala" to CMAKE_PREFIX_PATH or set
  "Vala_DIR" to a directory containing one of the above files.  If "Vala"
  provides a separate development package or SDK, be sure it has been
  installed.


 -- Configuring incomplete, errors occurred!

You haven't run git submodule init.

But before you try that, you should know that pdfpc development has moved to pdfpc/pdfpc, where we have removed the submodule and updated the code base to work with modern versions of vala.