plan9: fix installation instructions

Closes #4276

diff --git a/plan9/BUILD.PLAN9.txt b/plan9/BUILD.PLAN9.txt
index 1d04c5e7f2674f521bf9c9cf1722987101d4c5cd..6df23d31a7b108bf3704939a5a0bc75ebc9b96f3 100644 (file)
--- a/plan9/BUILD.PLAN9.txt
+++ b/plan9/BUILD.PLAN9.txt
@@ -17,10 +17,10 @@ Instruction
 ===========
 First, you should construct namespace as like described below:
 
-% bind -a ../lib lib
-% bind -a ../src src
-% bind -a ../include include
-% bind -a .. .
+% bind -ac ../lib lib
+% bind -ac ../src src
+% bind -ac ../include include
+% bind -ac .. .
 
 Then you will see as shown below (excerpt):