Icinga missing libltdl.so.3()(64bit) and libdbi.so.0()(64bit)

Today I got this error when installing icinga:

rpm -ivh icinga-1.5.1-1.el5.rf.x86_64.rpm
warning: icinga-1.5.1-1.el5.rf.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 6b8d79e6
error: Failed dependencies:
        libltdl.so.3()(64bit) is needed by icinga-1.5.1-1.el5.rf.x86_64

It’s not obvisious, but I had to install libtool-ltdl:

yum install libtool-ltdl.x86_64

I found it using pkgs.org.

The same applies to libdbi.so.0()(64bit) – I installed it using yum install libdbi