[LAU] phasex compile problems

Hi, I tried contacting phasex's developer, but with no reply. Maybe you will be able to give me a hand. I incurred in the following compile error: gcc -DHAVE_CONFIG_H -I. -I.. -I/usr/include/alsa -I/usr/local/include -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -D_GNU_SOURCE -D_REENTRANT -DPHASEX_CPU_POWER=2 -pipe -Wcast-align -mtune=native -march=native -m32 -O3 -ffast-math -fomit-frame-pointer -MT gtkui.o -MD -MP -MF .deps/gtkui.Tpo -c -o gtkui.o gtkui.c gtkui.c: In function ‘widget_set_backing_store_ callback’: gtkui.c:2101: error: ‘group’ undeclared (first use in this function) gtkui.c:2101: error: (Each undeclared identifier is reported only once gtkui.c:2101: error: for each function it appears in.) make[2]: *** [gtkui.o] Error 1 make[2]: Leaving directory `/home/keysschool/zynaddsubfx/phasex-0.12.0/src' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/home/keysschool/zynaddsubfx/phasex-0.12.0' make: *** [all] Error 2 I have a Pentium Dual-Core processor, so I enabled compile flags --enable-arch=native --enable-cpu-power=2. ./configure only asked me for libsamplerate and it ran smoothly after I installed it, and I'm positive I have libgtk(whatever)-dev installed as well. I'm running Ubuntu 8.10. Thank you, Adriano