Вроде стоит
gcc -DHAVE_CONFIG_H -I. -I. -I../.. -I../../lib/config -I../../lib/misc -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libxml2 -Wall -Werror -g0 -fPIC -std=gnu99 -MT libxnsound_la-sound.lo -MD -MP -MF .deps/libxnsound_la-sound.Tpo -c sound.c -fPIC -DPIC -o .libs/libxnsound_la-sound.o
cc1: warnings being treated as errors
In file included from /usr/include/glib-2.0/glib/gthread.h:32,
from /usr/include/glib-2.0/glib/gasyncqueue.h:30,
from /usr/include/glib-2.0/glib.h:32,
from /usr/include/gstreamer-0.10/gst/gst.h:27,
from sound.c:28:
/usr/include/glib-2.0/glib/gutils.h:316: warning: C99 inline functions are not supported; using GNU89
/usr/include/glib-2.0/glib/gutils.h:316: warning: to disable this warning use -fgnu89-inline or the gnu_inline function attribute
/usr/include/glib-2.0/glib/gutils.h:330: warning: C99 inline functions are not supported; using GNU89
/usr/include/glib-2.0/glib/gutils.h:343: warning: C99 inline functions are not supported; using GNU89
/usr/include/glib-2.0/glib/gutils.h:362: warning: C99 inline functions are not supported; using GNU89
/usr/include/glib-2.0/glib/gutils.h:370: warning: C99 inline functions are not supported; using GNU89
/usr/include/glib-2.0/glib/gutils.h:387: warning: C99 inline functions are not supported; using GNU89
/usr/include/glib-2.0/glib/gutils.h:396: warning: C99 inline functions are not supported; using GNU89
In file included from /usr/include/glib-2.0/glib/gasyncqueue.h:30,
from /usr/include/glib-2.0/glib.h:32,
from /usr/include/gstreamer-0.10/gst/gst.h:27,
from sound.c:28:
/usr/include/glib-2.0/glib/gthread.h:334: warning: C99 inline functions are not supported; using GNU89
make[3]: *** [libxnsound_la-sound.lo] Ошибка 1
make[3]: Leaving directory `/home/iddqdesnik/xneur-0.9.0/lib/sound'
make[2]: *** [all-recursive] Ошибка 1
make[2]: Leaving directory `/home/iddqdesnik/xneur-0.9.0/lib'
make[1]: *** [all-recursive] Ошибка 1
make[1]: Leaving directory `/home/iddqdesnik/xneur-0.9.0'
make: *** [all] Ошибка 2