The ebuild passes: --enable-h5 However, configure.ac is a total mess: AC_ARG_ENABLE([h5], [AS_HELP_STRING([--disable-h5],[disable H5 extension @<:@default=build@:>@])], [], [with_h5=yes]) if test x$with_h5 = xyes; then So passing --enable-h5 sets $enable_h5 but they actually check for $with_h5.
Thanks, for pointing this out. Previously they and the ebuild used --with-h5. I don't know why they changed to enable. I guess the same applies to sci-physics/rivet https://gitlab.com/hepcedar/rivet/-/blob/release-4-1-x/configure.ac?ref_type=heads#L105. I'll make the same MR there as you did there.
Yeah, I've just gotten to rivet and it's the same. Thanks for taking it from here!