[Reproducible-builds] Bug#789098: FTBFS: ./conjugue fails with internal error: "afligir e arg�ir colidem em FV"

[Chris West (Faux)]

Source: br.ispell
Version: 3.0~beta4
Severity: serious
Justification: fails to build from source (but built successfully in the past)

Dear Maintainer,

The package fails to build for me, although it appears to build sometimes on our Jenkins.
I suspect something to do with locales or locale variation, but I'm unable to confirm:
dh_testdir
# Build everything besides aspell
/usr/bin/make AWK=/usr/bin/gawk \
	formas br.aff br.base br.ispell
make[1]: Entering directory '/home/faux/br.ispell-3.0~beta4'
/usr/bin/gawk -f ./conjugue -v BANCO=verbos -v FORMATO=aa -v CMD=T >v.rules
Falha interna: afligir e arg�ir colidem em FV
Makefile:107: recipe for target 'br.aff' failed
make[1]: *** [br.aff] Error 1

I believe that the pair of words that are failing are the first words evaluated.

My build environment is "normal": LANG=en_GB.UTF-8, LC_ALL and other variables not explicitly set.
Jenkins is supposed to be set up the same way, and succeeds the build, but fails in the build that specifies LC_ALL.
Perhaps it is to do with the presence of correctly configured locale files, or perhaps it's totally unrelated.
I am unable to understand the script due to being linguistically impaired, so can't offer any futher help.

Jenkins build log:
https://reproducible.debian.net/rb-pkg/unstable/amd64/br.ispell.html


-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 3.19.0-20-generic (SMP w/8 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)