qx string

[Sayed, Irfan (Irfan)]

Hi All,
 
I am executing following line in my perl script.
 
chomp(@files = qx("cleartool desc -fmt "%[versions]p\n"
activity:$ENV{"CLEARCASE_ACTIVITY"}"));
 
But i am getting following error when i execute the script.
 
sh: cleartool desc -fmt %[versions]p: not found
sh:  activity:: not found

As per my understanding, double quotes inside the qx is causing the
prob.
 
Please guide how to resolve this.
 
Regards
Irfan.