Install Apache::Dispatch for mod_perl 1.

perl Makefile.PL -httpd /path/to/my/httpd make && make test && make install

Install Apache2::Dispatch for mod_perl 2.

perl Makefile.PL -httpd /path/to/my/httpd -apxs /path/to/my/apxs make && make test && make install

Install Apache2::Dispatch explicitly for mod_perl2.

perl Makefile.PL MOD_PERL=2
make && make test && make install

Install Apache::Dispatch explicitly for mod_perl1.

perl Makefile.PL MOD_PERL=1
make && make test && make install

Install Apache::Dispatch explicitly for mod_perl1, using PerlSetVar for Dispatch configuration.

export DISPATCH_PUREPERL=1
perl Makefile.PL MOD_PERL=1
make && make test && make install