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I'm not 100% certain these are required to build: rpm-build openjade linuxdoc-tools openldap-devel pam-devel openssl-devel rpm-devel. I'm also not certain all build dependencies are listed.

Download a Squid source RPM
Extract the SRPM (possibly with --no-md5 option):
rpm -ivh squid-3.0.STABLE15-2.fc11.src.rpm
Add build option --enable-esi to /usr/src/redhat/SPECS/squid.spec.

Install build loan modification dependencies:

yum install rpm-build openjade linuxdoc-tools openldap-devel pam-devel openssl-devel \
rpm-devel gcc-c++ expat-devel libxml2-devel krb5-devel e2fsprogs-devel

Run the build:

rpmbuild -bb /usr/src/redhat/SPECS/squid.spec

Install the new Squid RPM in /usr/src/redhat/RPMS/x86_64.