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The version of boost.m4 initially included in cc-tool has an issue with gcc5 (one of its tests fails due to the first change described in [1] "Preprocessor issues"). This was fixed upstream (boost.m4 project) in Nov 2014 [2]. We add the latest commit [3] of upstream boost.m4 plus a patch from github PR [4] to add detection for gcc 5.1. Fixes: http://autobuild.buildroot.net/results/a4c/a4c057e0b1ab6a2ffd69b27f6f5a79f98eb040f6/ [1] https://gcc.gnu.org/gcc-5/porting_to.html [2]32553aaf4d[3]d9ff75b6af[4]b879eb85f1Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>