Much thanks to Brett for the pointers on rpm-fu.

http://grantmcwilliams.com/index.php?option=com_content&view=article&id=229:

$ sudo yum install \
xen-devel \
xhtml1-dtds \
hal-devel \
libpcap-devel \
cyrus-sasl-devel \
parted-devel \
numactl-devel \
avahi-devel \
slang-devel \
libvolume_id-devel \
openldap-devel

# device-mapper-devel \
# xmlrpc-c-devel \

for pkg in \
libssh2-devel-1.2.5-1.el5.pp.x86_64.rpm \
libssh2-1.2.5-1.el5.pp.x86_64.rpm \
libssh-0.2.1-0.2.svn193.el5.pp.x86_64.rpm \
libssh-devel-0.2.1-0.2.svn193.el5.pp.x86_64.rpm
do
wget ftp://ftp.pbone.net/mirror/ftp.pramberger.at/systems/linux/contrib/rhel5/x86_64/$pkg
rpm -i $pkg
done

wget http://www.fateyev.com/RPMS/RHEL5/x86_64/xmlrpc-c-devel-1.14.8-1.el5.x86_64.rpm
wget http://www.fateyev.com/RPMS/RHEL5/x86_64/xmlrpc-c-1.14.8-1.el5.x86_64.rpm
rpm -i xmlrpc-c-*1.14*el5*.rpm

wget ftp://ftp.icm.edu.pl/vol/rzm1/linux-fedora-secondary/development/source/SRPMS/corosync-0.95-2.fc11.src.rpm
alien -t corosync-0.95-2.fc11.src.rpm
mv corosync-0.95.tgz /tmp
cd ~/rpm/SOURCES
tar xfz /tmp/corosync-0.95.tgz
patch -p0

--- corosync.spec.orig  2010-05-26 19:17:15.000000000 +0000
+++ corosync.spec       2010-05-26 19:21:39.000000000 +0000
@@ -39,11 +39,7 @@
 fi
 %endif
 
-%{_configure}  CFLAGS="$(echo '%{optflags}')" \
-               --prefix=/usr \
-               --sysconfdir=/etc \
-               --localstatedir=/var \
-               --libdir=%{_libdir}
+%{configure}   CFLAGS="$(echo '%{optflags}')"
 
 %build
 make %{_smp_mflags}
@@ -52,8 +48,8 @@
 rm -rf %{buildroot}
 
 make install DESTDIR=%{buildroot}
-install -d %{buildroot}%{_initddir}
-install -m 755 init/redhat %{buildroot}%{_initddir}/corosync
+install -d %{buildroot}%{_sysconfdir}/init.d
+install -m 755 init/redhat %{buildroot}%{_sysconfdir}/init.d/corosync
 
 ## tree fixup
 # drop static libs
@@ -95,7 +91,7 @@
 %{_sbindir}/corosync-fplay
 %{_sbindir}/corosync-pload
 %config(noreplace) /etc/corosync.conf
-%{_initddir}/corosync
+%{_sysconfdir}/init.d/corosync
 %dir %{_libexecdir}/lcrso
 %{_libexecdir}/lcrso/coroparse.lcrso
 %{_libexecdir}/lcrso/objdb.lcrso

rpmbuild -bb corosync.spec
sudo rpm -i ~/rpm/RPMS/x86_64/corosynclib*.rpm

wget ftp://ftp.icm.edu.pl/vol/rzm1/linux-fedora-secondary/development/source/SRPMS/openais-0.94-1.fc11.src.rpm
alien -t openais-0.94-1.fc11.src.rpm
mv openais-0.94.tgz /tmp
cd ~/rpm/SOURCES
tar xfz /tmp/openais-0.94.tgz
rpmbuild -bb openais.spec
sudo rpm -i ~/rpm/RPMS/x86_64/openaislib-*.rpm

wget ftp://ftp.icm.edu.pl/vol/rzm1/linux-fedora-secondary/development/source/SRPMS/lvm2-2.02.45-4.fc11.src.rpm
alien -t lvm2-2.02.45-4.fc11.src.rpm
mv lvm2-2.02.45.tgz /tmp
cd ~/rpm/SOURCES
tar xfz /tmp/lvm2-2.02.45.tgz
rpmbuild -bb lvm2.spec