Use local cpan lib by default

workflow/qhtcp-workflow

@@ -467,8 +467,8 @@ install_dependencies() {
 
   # Install perl CPAN modules
   echo "Installing perl CPAN modules"
-  debug "cpan" "${depends_perl[@]}"
+  debug "cpan -I ${depends_perl[*]}"
-  cpan "${depends_perl[@]}"
+  cpan -I "${depends_perl[@]}"
 
   # Install R packages
   echo "Installing R packages"