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I tried to install Unity Greeter (unity-greeter_0.2.8.orig.tar.gz) to my Ubuntu 12.04 system from source. But after enter ./configure in terminal, following error appeared:

This is snapshot for above error

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You should copy and paste the information as pure text into your Question instead as a picture. It will load quickly and is more useful. – Lucio Jan 26 '13 at 16:36
Why are you building from source? And if so, any reason not use the source package and use debuild? – gertvdijk Jan 26 '13 at 16:49

Building the original package is like this:

  1. Get the source package

    apt-get source unity-greeter
  2. Install the build dependencies (this will install the missing Vala compiler for you!):

    sudo apt-get build-dep unity-greeter
  3. Build it

    cd unity-greeter-0.2.8
    debuild -uc -us
  4. Install the package(s) built:

    cd ..
    ls -al *.deb
    sudo dpkg -i unity-greeter*.deb
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The terminal output is telling you that, when it cannot find the software valac. So you have to install this compiler to compile (if redundancy is allowed) your application and install it.

To install your missing library/compiler enter the following command in a terminal:

sudo apt-get install libvala-0.22* valac-0.22*
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