[Debian-med-packaging] Bug#929590: lagan FTCBFS: insane upstream build system

[Helmut Grohne]

Source: lagan
Version: 2.0-3
Tags: patch upstream
User: helmutg at debian.org
Usertags: rebootstrap

lagan fails to cross build from source. The upstream build system is
quite strange. It stuffs CFLAGS into variables such as CC and CXX, which
dh_auto_build overrides. Thus CFLAGS go missing. It also stores a C++
compiler in CC. The attached patch makes these variables behave as one
would expect. Please consider applying the attached patch.

Helmut
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