[Mailman-Users] Set GID ?

[Brent Shafer]

OK...  I've gotten GCC installed.  When I attempt to ./configure 
mailman, it tells me my permissions are incorrect.  I have the set to
User: mailman - r,w,e (read, write, execute capabilities)
Group:  mailman - r,w,e
Everybody:  r,w,e

I also cd'd to the mailman folder and set gid=mailman

I'm still getting the following:

[mailman at treca mailman-2.1.3]$ ./configure
checking for --with-python... no
checking for python... /usr/bin/python
checking Python interpreter... /usr/bin/python
checking Python version... 2.2.1
checking that Python has a working distutils... yes
checking for a BSD-compatible install... /usr/bin/install -c
checking whether make sets $(MAKE)... yes
checking for true... /bin/true
checking for --without-gcc... no
checking for gcc... gcc
checking for C compiler default output... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ANSI C... none needed
checking whether #! works in shell scripts... yes
checking for --with-var-prefix... no
checking for --with-permcheck... yes
checking for --with-username... mailman
checking for user name "mailman"... okay
checking for --with-groupname... mailman
checking for group name "mailman"... okay
checking permissions on /usr/local/mailman... configure: error:
***** Installation directory /usr/local/mailman is not configured pr
operly!
***** Set-gid bit must be set for directory: /usr/local/mailman
[mailman at treca mailman-2.1.3]$

To What am I supposed to set the gid, and how am I supposed to get that 
accomplished?

Thanks
Brent Shafer