userdel -rf abcd ; useradd abcd ; su abcd # Wipe user abcd, create fresh user abcd, become user abcd
echo "%_topdir /home/$USER/rpmbuild" > ~/.rpmmacros ; echo "%packager Test User " >> ~/.rpmmacros  # Tell rpm where to install files and fake id
cd ~ ; curl -O http://vault.centos.org/6.4/os/Source/SPackages/openssl-1.0.0-27.el6.src.rpm # Download the source package from CentOS
rpm --install openssl-1.0.0-27.el6.src.rpm 1>e1 2>e2 # Extract the source package to /rpmbuild/SOURCES
cd ~/rpmbuild/SPECS # This is where the package .spec file is extracted to
sed -i -e "s/no-ec/enable-ec/; s/no-ecdh/enable-ecdh/; s/no-ecdsa/enable-ecdsa/" ~/rpmbuild/SPECS/openssl.spec # Edit the .spec file
sed -i -e "s/^Source1: hobble-openssl/#&/; s/^%.SOURCE1. /#&/" ~/rpmbuild/SPECS/openssl.spec # Edit the .spec file
rpmbuild -bb openssl.spec 1>e1 2>e2 & # Rebuild the package using the edited .spec file