I am trying to compile glib-2.12.0
but at a stage i get an error message
<glib/gregex.h> no such file or directory.

i have googled for gregx.h and got nothing but this:-
Gentoo Forums :: View topic - [SOLVED] emerge -Du world blad przy glibmm

the poster says it was solved. But everything is in spanish.

May be this is a very much specific problem. But its very important to me.
Can anyone help?