t/10-cvss4.t fails on some systems (-Duselongdouble?)

[eserte]

The test suite fails on some of my smoker systems like this:

#   Failed test '5.6 --> CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N'
#   at t/10-cvss4.t line 16.
#          got: 5.7
#     expected: 5.6
# Looks like you failed 1 test of 442.
t/10-cvss4.t ...... 
Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/442 subtests 

I have four such fail reports, all generated with perls which were compiled with increased floating point accuracy (-Duselongdouble). However, there's also one system which had a pass (aarch64-linux-ld).