Mine

i386-pc-linux-gnu-gcc -O2 -mtune=i686 -pipe -Wall -Wpointer-arith -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -Wnested-externs -fno-strict-aliasing -o beryl main.o privates.o activation.o texture.o display.o screen.o window.o event.o paint.o option.o plugin.o session.o screen_options.o display_options.o type_mask.o ipcs.o -Wl,--export-dynamic  /usr/lib/libpng12.so -lz /usr/lib/libXcomposite.so /usr/lib/libXdamage.so /usr/lib/libXfixes.so /usr/lib/libXrandr.so /usr/lib/libXrender.so /usr/lib/libXinerama.so /usr/lib/libstartup-notification-1.so /usr/lib/libSM.so /usr/lib/libICE.so /usr/lib/libXau.so /usr/lib/libXdmcp.so /usr/lib/libGL.so -L/usr/X11R6/lib /usr/lib/libXext.so /usr/lib/libX11.so -ldl -lm
i386-pc-linux-gnu-gcc: /usr/lib/libGL.so: No such file or directory
make[2]: *** [beryl] Error 1
make[2]: Leaving directory `/var/tmp/portage/beryl-core-0.1.4/work/beryl-core-0.1.4/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/var/tmp/portage/beryl-core-0.1.4/work/beryl-core-0.1.4'
make: *** [all] Error 2

!!! ERROR: x11-wm/beryl-core-0.1.4 failed.
Call stack:
  ebuild.sh, line 1546:   Called dyn_compile
  ebuild.sh, line 937:   Called src_compile
  beryl-core-0.1.4.ebuild, line 38:   Called die

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

localhost X11 #