After reading the answers you got, I am for keeping the MY_FORMAT as abstract/high-level as possible. That is -DMY_FORMAT=LU_NV_IS_64_BIT is prefered to -DMY_FORMAT='%.17'.

In reply to Re: Defining an XS symbol in the Makefile.PL by bliako
in thread Defining an XS symbol in the Makefile.PL by syphilis

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