Setting the setgid bit at the right moment. Thanks Stephen Paul Weber for reporting this! - utmp - simple login manager  
  HTML git clone git://git.suckless.org/utmp
   DIR Log
   DIR Files
   DIR Refs
   DIR README
   DIR LICENSE
       ---
   DIR commit fb5997dc0ba9a458e9ebc79252e54a5f93e6bab8
   DIR parent d1b12bf78c564681c4fc1c5c0f36b3efe499f7d8
  HTML Author: Christoph Lohmann <20h@r-36.net>
       Date:   Wed, 31 Oct 2012 21:32:10 +0100
       
       Setting the setgid bit at the right moment. Thanks Stephen Paul Weber for
       reporting this!
       Diffstat:
         M Makefile                            |       2 +-
       
       1 file changed, 1 insertion(+), 1 deletion(-)
       ---
   DIR diff --git a/Makefile b/Makefile
       @@ -41,8 +41,8 @@ install: all
                @mkdir -p ${DESTDIR}${PREFIX}/bin
                @cp -f utmp ${DESTDIR}${PREFIX}/bin
                @chmod 755 ${DESTDIR}${PREFIX}/bin/utmp
       -        @chmod g+s ${DESTDIR}${PREFIX}/bin/utmp
                @chgrp ${GROUP} ${DESTDIR}${PREFIX}/bin/utmp
       +        @chmod g+s ${DESTDIR}${PREFIX}/bin/utmp
                @echo installing manual page to ${DESTDIR}${PREFIX}/man1
                @mkdir -p ${DESTDIR}${MANPREFIX}/man1
                @sed "s/VERSION/${VERSION}/g" < utmp.1 > ${DESTDIR}${MANPREFIX}/man1/utmp.1