build.sh in perfmonger-0.7.1

- old
+ new

@@ -1,10 +1,10 @@
 #!/bin/bash
 
 READLINK=$(type -p greadlink readlink | head -1)
 cd $(dirname $($READLINK -f $0))
 
-if [ $1 = "-" ]; then
+if [[ $1 = "-" ]]; then
     # do self build
     case `uname -s` in
         (Linux)
             os="linux"
             ;;