On 19 Jun 2009, at 18:37, David Dooling wrote:
I am trying to clean up the prerequisites for a package that requires
both DBI and DBD::SQLite (UR). CPAN wants to order the prerequisites
in alphabetical order, so it tries to install DBD::SQLite first. It
comes to this part of the DBD::SQLite Makefile.PL code
# Because DBI generates a postamble at configure-time, we need
# the required version of DBI very early.
my $DBI_required = 1.57;
eval {
require DBI;
};
if ( $@ or DBI->VERSION < $DBI_required ) {
print "DBI 1.57 is required to configure this module,
please install it or upgrade your CPAN/CPANPLUS shell\n";
exit(0);
}
and fails (although the exit status is zero) because an older version
of DBI is installed. Even though DBI later appears and as PREREQ_PM
in the WriteMakefile call, that line never gets executed, the Makefile
never gets created, and CPAN will go no further with the DBD::SQLite
install. CPAN does continue to try to install other modules,
ultimately failing the requested install because DBD::SQLite is
missing (or too old).
I am not sure what the issue around the DBI postamble is so I am not
sure how to fix this so DBD::SQLite to play nicely with CPAN. Any
ideas/guidance on how to get this to behave as one might expect?
Two possible solutions I can think of:
1) configure_requires. Doesn't help with old clients
2) Use the 'Are we running under a CPAN shell' from the (now improved)
Module::Install::AutoInstall.
Oh, a bonus 3rd option.
3) Remove the check and delay it to the first test which does BAIL_OUT
if DBI is too old.
-ash
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