pkg-config non trova gtk + -3.0

Dichiara qui che il pacchetto gtk + -3.0 non è stato trovato:

[email protected]:~$ pkg-config --cflags gtk+-3.0 Package gtk+-3.0 was not found in the pkg-config search path. Perhaps you should add the directory containing `gtk+-3.0.pc' to the PKG_CONFIG_PATH environment variable No package 'gtk+-3.0' found 

Comunque apparentemente ho installato gtk3:

 [email protected]:~$ dpkg -l libgtk* | grep -e '^i' | grep -e 'libgtk-*[0-9]' ii libgtk-3-0:amd64 3.14.15-0ubuntu1~14.04~ricotz1 amd64 GTK+ graphical user interface library ii libgtk-3-bin 3.14.15-0ubuntu1~14.04~ricotz1 amd64 programs for the GTK+ graphical user interface library ii libgtk-3-common 3.14.15-0ubuntu1~14.04~ricotz1 all common files for the GTK+ graphical user interface library ii libgtk2.0-0:amd64 2.24.23-0ubuntu1.3 amd64 GTK+ graphical user interface library ii libgtk2.0-bin 2.24.23-0ubuntu1.3 amd64 programs for the GTK+ graphical user interface library ii libgtk2.0-common 2.24.23-0ubuntu1.3 all common files for the GTK+ graphical user interface library 

Tuttavia non riesco a trovare il file gtk+-3.0.pc :

 [email protected]:~$ sudo find / -name "gtk+-3.0.pc" [email protected]:~$ 

Qualche idea? Sto cercando di usare cmake ma non riesce a trovare gtk3.

Ho solo installato i normali file gtk3, non i file di sviluppo necessari per cmake per fare uso di:

 sudo apt-get install build-essential libgtk-3-dev