ExtUtils::MakeMaker's Makefile.PL has a postamble sub where you can specify things to be injected into the produced Makefile. In theory you can add Makefile code to compile and install your binaries as your module is make'ed. That would be permanent. But as anonymous monk said, quickest way would be to find the XS produced and just include it in your distribution (somehow! I am a novice of XS, I can not tell you how).
BTW, when I even do whichpm JavaScript::Embedded it takes ages (18sec) to complete! 100x more than other modules.
BTW2, my compiler complains that croak(msg) (in fatal_handler of produced XS) needs a format and this croak("%s", msg) keeps it happy. Is that an Inline::C issue I wonder (perl 5.32/linux almost latest) hint-hint syphilis.
bw, bliako