If PERL_USE_UNSAFE_INC is not set, build fails at 'make check' at the 'gxyrs' test:
FAILED: gxyrs returned 2 which did not match the expected 1
Probably the test is implicitly relying on a -I. being default (which perl upstream is migrating away from)
gxyrs tests starts to fail after perl upgrade (5.24 => 5.26). The same happens with Lepton EDA: https://github.com/lepton-eda/lepton-eda/issues/231 https://github.com/lepton-eda/lepton-eda/pull/232
For Lepton EDA this was fixed in b60bdf4 (24/Jul/2018).
https://github.com/lepton-eda/lepton-eda/commit/b60bdf48f0fe16bd874c315c2123b4ce02def8bc
Bug watches keep track of this bug in other bug trackers.
Probably the test is implicitly relying on a -I. being default (which perl upstream is migrating away from)