fix INSTALL warnings

R=rsc
http://codereview.appspot.com/6258060

src/cmd/acid/expr.c

@@ -1076,7 +1076,6 @@ acidregsrw(Regs *r, char *name, u64int *u, int isr)
 	Value *v;
 	Node *n;
 	u64int addr;
-	u32int u32;
 
 	if(!isr){
 		werrstr("cannot write registers");

src/cmd/fontsrv/mkfile

@@ -11,4 +11,4 @@ OFILES=\
 
 <$PLAN9/src/mkone
 
-
+osx-cocoa.$O: osx.c

src/cmd/fontsrv/osx-cocoa.c

@@ -0,0 +1 @@
+#include "osx.c"

src/cmd/venti/srv/mkfile

@@ -89,7 +89,7 @@ $SLIB: $LIBOFILES
 acid:D: lumpcache.acid
 	cat $prereq >$target
 
-$O.conf:D: conf.rc
+$O.conf:DQ: conf.rc
 	{
 		echo '#!/usr/local/plan9/bin/rc'
 		echo '# THIS FILE IS AUTOMATICALLY GENERATED'

src/cmd/venti/srv/printarenapart.c

@@ -11,7 +11,8 @@ usage(void)
 	threadexitsall("usage");
 }
 
-static void
+/* unused */
+void
 rdarena(Arena *arena, u64int offset)
 {
 	u64int a, aa, e;

src/mkfile

@@ -16,7 +16,6 @@ libs-%:V:
 	do
 		(cd $i; echo cd `pwd`';' mk $MKFLAGS $stem; mk $MKFLAGS $stem)
 	done
-	[ "$SYSNAME" != Darwin ] || ranlib ../lib/*.a
 
 MKDIRS=\
 	libbio\