Hi, Trying to compile libvirt on Centos 5.2, get the following when running configure: .... checking for struct _xmlURI.query_raw... no checking gnutls/gnutls.h usability... yes checking gnutls/gnutls.h presence... yes checking for gnutls/gnutls.h... yes checking for gnutls_handshake in -lgnutls... no configure: error: You must install the GnuTLS library in order to compile and run libvirt It's definitely installed: Installed Packages gnutls.x86_64 1.4.1-3.el5_1 installed gnutls.i386 1.4.1-3.el5_1 installed gnutls-devel.i386 1.4.1-3.el5_1 installed gnutls-devel.x86_64 1.4.1-3.el5_1 installed gnutls-utils.x86_64 1.4.1-3.el5_1 installed xmlsec1-gnutls.x86_64 1.2.9-8.1 installed xmlsec1-gnutls.i386 1.2.9-8.1 installed xmlsec1-gnutls-devel.i386 1.2.9-8.1 installed xmlsec1-gnutls-devel.x86_64 1.2.9-8.1 installed Thanks, David.