Fails to build when libaudit not installed

[Brendan James]

I have been trying to install LightDM 1.16.2 from source after installing all the dependencies (as listed in ebuild files found in the Portage tree for LightDM 1.16.1, http://gpo.zugaina.org/AJAX/Ebuild/10364684/View) with Entropy. To do this I downloaded the source code tarball (.tar.xz), extracted it, cd'ed to the extracted directory and ran:

./configure
make

at which point I got the error message:

session-child.c:420:26: error: ‘AUDIT_USER_LOGIN’ undeclared (first use in this function)
             audit_event (AUDIT_USER_LOGIN, username, -1, remote_host_name, tty, FALSE);
                          ^
session-child.c:420:26: note: each undeclared identifier is reported only once for each function it appears in
session-child.c:775:26: error: ‘AUDIT_USER_LOGOUT’ undeclared (first use in this function)
             audit_event (AUDIT_USER_LOGOUT, username, uid, remote_host_name, tty, TRUE);
                          ^
Makefile:1061: recipe for target 'lightdm-session-child.o' failed
make[2]: *** [lightdm-session-child.o] Error 1
make[2]: Leaving directory '/home/fusion809/Programs/lightdm-1.16.2/src'
Makefile:481: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/fusion809/Programs/lightdm-1.16.2'
Makefile:413: recipe for target 'all' failed
make: *** [all] Error 2

I get the same error when I run:

./autogen.sh
make