pangoxft found
checking Startup notification library >= 0.7... yes
Building with libstartup-notification
checking Xcomposite >= 0.2... yes
CompositeExt support forced on
Building with CompositeExt
checking Xcursor... yes
Building with Xcursor
checking for METACITY... configure: error: Package requirements (gtk+-2.0 >= 2.2.0 pango >= 1.2.0 gconf-2.0 >= 1.2.0 libstartup-notification-1.0 >= 0.7 xcomposite >= 0.2 xfixes xrender xdamage cm xcursor) were not met.
Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively you may set the METACITY_CFLAGS and METACITY_LIBS environment variables
to avoid the need to call pkg-config.  See the pkg-config man page for
more details.

!!! Please attach the following file when filing a report to bugs.gentoo.org:
!!! /var/tmp/portage/metacity-2.15.3/work/metacity-2.15.3/config.log

!!! ERROR: x11-wm/metacity-2.15.3 failed.
Call stack:
  ebuild.sh, line 1527:   Called dyn_compile
  ebuild.sh, line 931:   Called src_compile
  ebuild.sh, line 1240:   Called gnome2_src_compile
  gnome2.eclass, line 57:   Called gnome2_src_configure
  gnome2.eclass, line 53:   Called econf '--disable-xinerama' '--enable-compositor' '--disable-gtk-doc'
  ebuild.sh, line 533:   Called die

!!! econf failed
!!! If you need support, post the topmost build error, and the call stack if relevant.