i'm not able to build gtkparasite

when i run:

./autogen.sh

i'm get this error

checking for GTK... no

configure: error: Package requirements (gtk+-3.0 >= 3.10.0 gtksourceview-3.0) were not met:



Requested 'gtk+-3.0 >= 3.10.0' but version of GTK+ is 3.6.1

Consider adjusting the PKG_CONFIG_PATH environment variable if you

installed software in a non-standard prefix.

Alternatively, you may set the environment variables GTK_CFLAGS

and GTK_LIBS to avoid the need to call pkg-config.

See the pkg-config man page for more details.

So, when i do:

echo $PKG_CONFIG_PATH

it show me a blank, line so i adjust it with:

$ locate pkg-config

/etc/bash_completion.d/pkg-config

/usr/bin/pkg-config

/usr/lib/python2.7/dist-packages/numpy/core/lib/npy-pkg-config

...........

$ export PKG_CONFIG_PATH=/usr/bin/pkgconfig

but the error persist.

How I can do to build this sources?