Add the #goo to allow use in C++.
Silence a few more warnings.
Strip down the mkfiles more.
Fix bug in X11 mouse handling, note groups.
diff --git a/include/ip.h b/include/ip.h
index af82c99..6fbf394 100644
--- a/include/ip.h
+++ b/include/ip.h
@@ -1,3 +1,8 @@
+#ifndef _IP_H_
+#define _IP_H_ 1
+#if defined(__cplusplus)
+extern "C" { 
+#endif
 /*
 #pragma	src	"/sys/src/libip"
 #pragma	lib	"libip.a"
@@ -121,3 +126,7 @@
 
 #define CLASS(p) ((*(uchar*)(p))>>6)
 
+#if defined(__cplusplus)
+}
+#endif
+#endif