Gentoo: No package `glib-2.0` found

I have a strange problem when trying to install dev-lib/gobject-introspection: >>> Emerging (1 of 9) dev-libs/gobject-introspection-1.42.0 ...... configure: error: Package requirements (glib-2.0 > 2.36.0) were not met: No package glib-2.0 found I have dev-libs/glib-2.42.1 installed, but there is some strange issue with pkg-config: $ pkg-config --modversion glib-2.0 Package glib-2.0 was not found in the pkg-config search path. Perhaps you should add the directory containing glib-2.0.pc to the PKG_CONFIG_PATH environment variable No package 'glib-2.0' found $ echo $PKG_CONFIG_PATH $ And looks like there is no glib-2.0.pc file in /usr/lib/pkgconfig . There is the file /usr/lib32/pkgconfig/glib-2.0.pc, but for previous version of glib-2.38.2 Can anybody explain to me, what can be wrong and how can fix this? I've already asked this question on the gentoo forum , but maybe I'll have better luck here.