Poblem while build a package (PR#7798)

Full_Name: Justin Bem
Version: 1.9.1
OS: Windows XP Home
Submission from: (NULL) (196.202.235.48)


I am a R new user !

I have writed procedure that i wantto transform as a package but with
RCMD build packageName [...]

I have 'sh' is not a recognized command in the dos promp I have Active Perl 5.8
!
Does I need to have another software or it is a Perl problem ?

I hope you will find a solution for me 

Salutations !