diff --exclude='*.diff' -rduNp ../qemu_trunk.orig/configure ./configure
--- ../qemu_trunk.orig/configure	2007-01-04 14:38:58.000000000 +0100
+++ ./configure	2007-01-04 14:48:14.000000000 +0100
@@ -509,6 +509,17 @@ fi # sdl compile test
 fi # cross compilation
 fi # -z $sdl
 
+##########################################
+# sound support libraries
+# alsa
+if test "$alsa" = "yes" ; then
+  cat > $TMPC << EOF
+#include <alsa/asoundlib.h>
+int main(void) { snd_pcm_t **handle; return snd_pcm_close(*handle); }
+EOF
+  $cc -o $TMPE $TMPC -lasound 2> /dev/null || alsa="no"
+fi # alsa
+
 # Check if tools are available to build documentation.
 if [ -x "`which texi2html`" ] && [ -x "`which pod2man`" ]; then
   build_docs="yes"