How to raise verbosity of Installer.app? I'm having troubles with the system installer (/System/Library/CoreServices/Installer.app) where certain things are not installing and are not providing sufficient details in /var/log/install.log.

I get the dreaded "The installation failed" error:


Without sufficient details within the log as noted above.

Is there a way to raise verbosity so as to ascertain precisely where it may be failing within the install process?  I have been hoping that there is a flag that can be executed to increase this verbosity, but I've not found anything for 

/System/Library/CoreServices/Installer.app/Contents/MacOS/Installer 


as of yet when executing it from the shell...
You can use the command line installer (in /usr/sbin/installer).

From the man page:


  The installer command is used to install Mac OS X installer packages to a specified domain or volume.


and use the -verbose or -verboseR options.

By example :

installer -verbose -pkg DeveloperTools.mpkg -target /