Hello everyone.

I'm running Kubuntu 12.10 with lightdm as the only window manager.

I installed all the dependencies for the unity manager and also installed the unity-greeter from synaptic package manager.
I then edited the lightdm.conf and set it to use the unity greeter.
Then I ran the command :
lightdm --test-mode
The xephyr window opened and closed.

When I set the greeter back to kde and tested it, it worked fine.

After that, I tried the manual install and on running ./configure, I got this:
devesh@3000-N100:~/Downloads/unity$ ./configure
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking for style of include used by make... GNU
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking dependency style of gcc... gcc3
checking whether gcc and cc understand -c and -o together... yes
checking for valac-0.16... no
checking for valac... /usr/bin/valac
checking /usr/bin/valac is at least version 0.15.1... yes
checking whether to enable maintainer-specific portions of Makefiles... no
checking whether make supports nested variables... yes
checking for pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.16... yes
checking for UNITY_GREETER... no
configure: error: Package requirements (
    liblightdm-gobject-1 >= 1.3.3
) were not met:

No package 'indicator3-0.4' found

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables UNITY_GREETER_CFLAGS
and UNITY_GREETER_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.
How do I set the environment variables?
Please tell me where I am going wrong.