Compilation with -DDEBUG_TIMING fails due to a missing header:
modules/alsa/alsa-source.c: In function 'check_left_to_record':
modules/alsa/alsa-source.c:426:9: warning: implicit declaration of function 'raise' [-Wimplicit-function-declaration]
modules/alsa/alsa-source.c:426:9: error: 'SIGTRAP' undeclared (first use in this function)
Signed-off-by: Eero Nurkkala <eero.nurkkala@offcode.fi>