We use a few different ifdef's names to check if we are using Casper or not,
-rw-r--r-- 85 .arcconfig
-rw-r--r-- 418 .arclint
-rw-r--r-- 6142 COPYRIGHT
-rw-r--r-- 687 LOCKS
-rw-r--r-- 5601 MAINTAINERS
-rw-r--r-- 22936 Makefile
-rw-r--r-- 96253 Makefile.inc1
-rw-r--r-- 6613 Makefile.libcompat
-rw-r--r-- 439773 ObsoleteFiles.inc
-rw-r--r-- 2631 README
-rw-r--r-- 2702 README.md
-rw-r--r-- 82773 UPDATING
drwxr-xr-x - bin
drwxr-xr-x - cddl
drwxr-xr-x - contrib
drwxr-xr-x - crypto
drwxr-xr-x - etc
drwxr-xr-x - gnu
drwxr-xr-x - include
drwxr-xr-x - kerberos5
drwxr-xr-x - lib
drwxr-xr-x - libexec
drwxr-xr-x - release
drwxr-xr-x - rescue
drwxr-xr-x - sbin
drwxr-xr-x - secure
drwxr-xr-x - share
drwxr-xr-x - sys
drwxr-xr-x - targets
drwxr-xr-x - tests
drwxr-xr-x - tools
drwxr-xr-x - usr.bin
drwxr-xr-x - usr.sbin