[Debian-med-packaging] Bug#904145: concavity FTCBFS: uses a C compiler for C++ sources

[Helmut Grohne]

Source: concavity
Version: 0.1+dfsg.1-2
Tags: patch upstream
User: helmutg at debian.org
Usertags: rebootstrap

concavity fails to cross build from source, because it uses a C compiler
for C++ sources. The upstream Makefile assigns CC=g++, which is quite
non-standard. When dh_auto_build overrides CC with a cross C compiler,
things go wrong badly. Renaming CC to the standard CXX variable makes
the build succeed as dh_auto_build passes a C++ compiler there. Please
consider applying the attached patch.

Helmut
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