[libvirt-users] Libvirt installion error: You must install the libyajl library & headers to compile libvirt

Dear all, I am installing the libvirt 1.2.5 on my newly installed Fedora19. When I run ./configure, an error is reported: "You must install the libyajl library & headers to compile libvirt" In fact, the package yajl-2.0.4-2fc19.x86_64.rpm has been installed on the fedora19. I found several links talking about this error and I downloaded 3 files (configure.ac, m4/virt-yajl.m4, src/qemu/qemu_capabilities.c) from the link given by Daniel Berrange (http://libvirt.org/git/?p=libvirt.git;a=commit;h=654c709baaa6fdcff6b6d38a...) , but it does not work. Am I missing something? Best regards, Cheng