You must install the gtk+ widget library first. It can be found at the gimp ftp site.
Gnirc can be downloaded from
here.
( Use tar -xvzf gnirc-0.1a.tar.gz
to extract the sources files)
You'll need to edit the makefile if :
/usr/X11R6/lib
/usr/local/lib
)
Finaly go in the gnirc source directory and type
make
make install