How to check if Wt framework is installed correctly on Debian wheezy?

Answer: it is needed to build Wt examples.
If Wt framework is installed correctly then examples will be built successfully.

Below are steps how to build Wt examples.
Here is considered that Wt is installed with examples and libwtfcgi-dev.
How to install it you can read here.

Steps to build Wt examples on Debian wheezy:

1. Create directory where cmake will create makefiles:
#> mkdir /home/%user%/build/wtexamples
#> cd /home/%user%/build/wtexamples

2.  Run cmake to create makefiles:
#> cmake -DWT_SOURCE_DIR=/usr/lib/Wt \
    -DCONNECTOR_FCGI=ON \
        -DEXAMPLES_CONNECTOR="wtfcgi" \
        -DCMAKE_BUILD_TYPE=Release \
        /usr/lib/Wt/examples

3. Build hello example:
#> cd /home/%user%/build/wtexamples/hello

#> make

In result you should get something like that:

4. If hello example is built successfully then you can try to build all examples:
#> cd /home/%user%/build/wtexamples
#> make

If all examples is built successfully most probably your Wt was installed properly.