$ uname -mrs
FreeBSD 6.2-PRERELEASE i386

~/irssi-0.8.10$ ./configure
<foo>
checking whether GLib is unpacked to irssi dir... no
./configure: line 7168: syntax error near unexpected token `1.2.0,,,'
./configure: line 7168: `      AM_PATH_GLIB(1.2.0,,, $glib_modules)'

/usr/local/share/aclocal$ ls glib*
glib-2.0.m4      glib-gettext.m4  glib.m4          glibc2.m4        glibc21.m4

/usr/local/lib$ l libglib*
libglib-12.a      libglib-12.so.3*  libglib-2.0.la*   libglib-2.0.so.0*
libglib-12.so@    libglib-2.0.a     libglib-2.0.so@   libglib.a@

$ glib-config --version
1.2.10