This is needed for GNU/Hurd build. These _IOT__IOTBASE_* definitions will not
work of course, that's ok since we do not support sound yet anyway, and we do
not export this to other packages.

Index: oss4-4.2-build2004/lib/libsalsa/local.h
===================================================================
--- oss4-4.2-build2004.orig/lib/libsalsa/local.h	2011-06-14 11:33:22.000000000 -0500
+++ oss4-4.2-build2004/lib/libsalsa/local.h	2011-06-14 11:35:15.000000000 -0500
@@ -96,3 +96,12 @@
 extern void midiparser_callback (void *context, int category,
 				 unsigned char msg, unsigned char ch,
 				 unsigned char *parms, int len);
+
+#define _IOT__IOTBASE_oss_longname_t _IOT (0, 0, 0, 0, 0, 0)
+#define _IOT__IOTBASE_audio_buf_info _IOT (0, 0, 0, 0, 0, 0)
+#define _IOT__IOTBASE_oss_sysinfo _IOT (0, 0, 0, 0, 0, 0)
+#define _IOT__IOTBASE_oss_mixext _IOT (0, 0, 0, 0, 0, 0)
+#define _IOT__IOTBASE_oss_mixer_value _IOT (0, 0, 0, 0, 0, 0)
+#define _IOT__IOTBASE_oss_audioinfo _IOT (0, 0, 0, 0, 0, 0)
+#define _IOT__IOTBASE_oss_mixerinfo _IOT (0, 0, 0, 0, 0, 0)
+#define _IOT__IOTBASE_oss_card_info _IOT (0, 0, 0, 0, 0, 0)