[syslog-ng] Errors compiling syslog-ng 3.6.4 in CentOS 7.1

[C. L. Martinez]

Hi all,

 I am trying to update my syslog-ng 3.5.x release to syslog-ng 3.6.4.
When I run autogen.sh, the following error appears:

[root at c071pubwww syslog-ng-syslog-ng-3.6.4]# ./autogen.sh
Running autogen in 'lib/ivykis'...
Don't know how to bootstrap submodule 'lib/ivykis'

Any idea??