FWIW I applied a blind fix upstream:
https://github.com/wojdyr/fityk/commit/9684b96e336ae7c926d70dbccf03f1618eee7433
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Source: fityk
Version: 1.3.1-1
Severity: serious
Tags: patch
https://buildd.debian.org/status/fetch.php?pkg=fityk=i386=1.3.1-2=1506310354=0
https://tests.reproducible-builds.org/debian/rb-pkg/buster/i386/fityk.html
...
make check-TESTS
make[3]: Entering directory '/<>'
make[4]: Entering
