gtk 3 and gtkmm 3 installation from sources

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http://www.linuxquestions.org – hi all i am trying to install gtkmm 3 on my slackware 13.37 from source packages (official packages from gtk and gtkmm web site). after sucessful install of gtk 3.0 and glibmm 2.28 the configure script for gtkmm 3 package tell me this: Code: configure: error: Package requirements (gtk+-3.0 >= 3.0.0) were not met: No package ‘gtk+-3.0′ 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 GTK_CFLAGS and GTK_LIBS to avoid the need to call pkg-config. See th (HowTos)