Solve make Permission denied in tinyos

if you got following errors:

jack@ubuntu: /opt/tinyos-2.1.1/apps/Blink$ make micaz

mkdir -p build/micaz

mkdir: cannot create directory `build': Permission denied

make: *** [builddir] Error 1

then just type:

sudo chown yourname:yourname -R /opt/tinyos-2.1.1/

note: replace yourname by your login account name, such as use jack:jack if your see jack@ubuntu