when xcode license was not accepted there should be a helpful error message

[fabian@…]

For example I just installed valgrind and got this error (for some reason xcode didn't have the EULA marked as accepted anymore):

$ sudo port install valgrind ... ---> Building valgrind Error: org.macports.build for port valgrind returned: command execution failed To report a bug, follow the instructions in the guide:

​http://guide.macports.org/#project.tickets

Error: Processing of port valgrind failed frankfa@palmtree:~/repo/nativesdk (1) $ sudo port install valgrind ---> Computing dependencies for valgrind ---> Building valgrind Error: org.macports.build for port valgrind returned: command execution failed Please see the log file for port valgrind for details:

/opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_valgrind/valgrind/main.log

To report a bug, follow the instructions in the guide:

​http://guide.macports.org/#project.tickets

Error: Processing of port valgrind failed

So I $ cat /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_valgrind/valgrind/main.log ... :info:build You have not agreed to the Xcode license agreements, please run 'xcodebuild -license' (for user-level acceptance) or 'sudo xcodebuild -license' (for system-wide acceptance) from within a Terminal window to review and agree to the Xcode license agreements. ...

And the error is clear. However, for less experienced users, it might be very confusing. How about adding a less generic error message for this case, or maybe even run xcodebuild -license for the user if this happens.