Bug#969119: libquantum FTCBFS: uses AC_RUN_IFELSE

[Helmut Grohne]

Source: libquantum
Version: 1.1.1-5
Tags: patch upstream
User: debian-cross at lists.debian.org
Usertags: ftcbfs

libquantum fails to cross build from source, because it uses
AC_RUN_IFELSE. In some situations, that macro is unavoidable. The use of
libquantum isn't, because it is evaluating a compile-time constant. We
can also check that using AC_CHECK_SIZEOF and AC_COMPUTE_INT, both of
which work during cross compilation. Please consider applying the
attached patch to avoid using AC_RUN_IFELSE at no cost in functionality.

Helmut
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