Added CHROOT=on for compiling packages in chroot enviroment

install/calculate

@@ -2825,7 +2825,7 @@ sub checksystem{
 		#$data{emergerun2} = "";
 		if($data{builder}){
 			if(!defined $data{addition}){
-				$data{emergerun1} = "$data{path} chroot $data{chroot} /bin/bash -c \"$data{emergerun1} /usr/bin/emerge";
+				$data{emergerun1} = "$data{path} CHROOT=on chroot $data{chroot} /bin/bash -c \"$data{emergerun1} /usr/bin/emerge";
 				$data{emergerun2} = "\"";
 			}else{
 				$data{emergerun1} = "$data{emergerun1} /usr/bin/emerge";