%general-entities; ]> Perl sed -i -e '/^BUILD_ZLIB/s/True/False/' \ -e '/^INCLUDE/s,\./zlib-src,/usr/include,' \ -e '/^LIB/s,\./zlib-src,/usr/lib64,' \ cpan/Compress-Raw-Zlib/config.in Perl does not, by default, know about library directories with names other than lib. The following patch will allow it to install to other directories: patch -Np1 -i ../&perl-multilib-patch; ./configure.gnu --prefix=/usr \ -Dvendorprefix=/usr \ -Dman1dir=/usr/share/man/man1 \ -Dman3dir=/usr/share/man/man3 \ -Dpager="/bin/less -isR" \ -Dlibpth="/usr/local/lib64 /lib64 /usr/lib64" \ -Dcc="gcc ${BUILD64}" \ -Dusethreads -Duseshrplib -Dlibpth="/usr/local/lib64 /lib64 /usr/lib64" This tells Perl to link against the 64-bit libraries. mv -v /usr/bin/perl{,-64} mv -v /usr/bin/perl&perl-version;{,-64} Now we need to create a link to the multiarch wrapper that lets us choose which perl installation to use: ln -sv multiarch_wrapper /usr/bin/perl ln -sv multiarch_wrapper /usr/bin/perl&perl-version; The value of the USE_ARCH environment variable will decide which perl binary to execute. USE_ARCH=32 perl -V:cc will give the value of CC used to build the 32bit perl. The multiarch_wrapper will help later with building perl extensions and bindings. Without the multiarch_wrapper it is very hard to setup a 32bit extension or binding.