Installation of media-applet

I try to install media-applet with ./waf configure --prefix=/usr
But it stops at:

emil@linux-im5p:~/Desktop/media-applet-0.3.2> ./waf configure --prefix=/usr
Checking for program gcc                 : ok /usr/bin/gcc 
Checking for compiler version            : ok 4.3 
Checking for program cpp                 : ok /usr/bin/cpp 
Checking for program ar                  : ok /usr/bin/ar 
Checking for program ranlib              : ok /usr/bin/ranlib 
Checking for compiler could create programs : ok  
Checking for compiler could create shared libs : ok  
Checking for compiler could create static libs : ok  
Checking for flags -O2                         : ok  
Checking for flags -g -DDEBUG                  : ok  
Checking for flags -g3 -O0 -DDEBUG             : ok  
Checking for flags -Wall                       : ok  
Checking for gcc                               : ok  
Checking for program valac                     : ok /usr/bin/valac 
Checking for package gthread-2.0               : not found 
Checking for program version valac >= 0.1.6    : ok 0.3.3 
Checking for program msgfmt                    : ok /usr/bin/msgfmt 
Checking for program intltool-merge            : not found 
Checking for header locale.h                   : ok  
Checking for package glib-2.0 >= 2.12.0        : not found 
pkg-config cannot find glib-2.0 >= 2.12.0 
emil@linux-im5p:~/Desktop/media-applet-0.3.2>

Where can I find glib in 2.21 version?