Add the rule to install inc setgid if requested.
-rw-r--r-- 949 .gitignore
-rw-r--r-- 1619 COPYRIGHT
-rw-r--r-- 143202 ChangeLog
-rw-r--r-- 16 DATE
-rw-r--r-- 12392 INSTALL
-rw-r--r-- 3547 MACHINES
-rw-r--r-- 17892 Makefile.am
-rw-r--r-- 1329 README
-rw-r--r-- 8 VERSION
-rwxr-xr-x 166 autogen.sh
-rwxr-xr-x 43610 config.guess
-rwxr-xr-x 31495 config.sub
drwxr-xr-x - config
-rw-r--r-- 27137 configure.ac
drwxr-xr-x - docs
drwxr-xr-x - etc
drwxr-xr-x - h
drwxr-xr-x - m4
drwxr-xr-x - man
drwxr-xr-x - mts
-rw-r--r-- 4043 nmh.spec
drwxr-xr-x - sbr
drwxr-xr-x - test
drwxr-xr-x - uip