Ctest failures only in i586 builds

Our gnuradio-3.7.1 package (from recent git) builds for x86_64 now pass
all tests on the Mageia build system. (qa_qtgui is excluded).

I found that we needed to export LD_LIBRARY_PATH=%{buildroot}%{_libdir}
in the build chroot for ctest to find the libs.

However I am seeing test failures on the i586 build.

The tests are run during the rpm package build with:

ctest -V -E qa_qtgui ||:

…so the tests are verbose and failures don’t stop the build.

Can anyone figure out why these tests fail only in the i586 build?

i586 build log:

x86_64 build log: