You appear to have them the wrong way around, it should be:

cpan> o conf mbuild_install_arg '--uninst 1'
cpan> o conf make_install_arg UNINST=1

[download]

Similar settings in CPANPLUS are:

CPAN Terminal> s conf buildflags uninst=1
CPAN Terminal> s conf makeflags UNINST=1
CPAN Terminal> s save

[download]

In reply to Re^2: Upgrading Core Modules Using CPAN - Best Practice? by bingos
in thread Upgrading Core Modules Using CPAN - Best Practice? by stocks29

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