[Ltib] Post build script

[Ned Konz]

I'd like to run a post build script to set up my bootloader.

I have set

WANT_BUILD_SCRIPT=y
POST_BUILD_SCRIPT=losh-startup.sh

where losh-startup.sh is in my $TOP directory

I have

source ../../userspace/post_build_script.lkc

at the bottom of my main.lkc


but it's not clear to me where/when the post build script is supposed  
to get run.

Is this specified somewhere in a package spec?