use which("bash") instead of absolute path. some *BSD system install bash to /usr/bin
Checking in changes prior to tagging of version 0.25.

Changelog diff is:

diff --git a/Changes b/Changes
index 2f8fac6..79ceb2d 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,9 @@
 Revision history for Perl extension Proclet

+0.25    Wed Feb 20 1:05:14 2013
+        - use which("bash") instead of absolute path.
+          some *BSD system install bash to /usr/bin
+
 0.24    Mon Feb 18 10:21:21 2013
         - fixed test. bug in checking size