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Building various libraries (libc6, libc6-pic, libc6-staticdev, libc6-dbg, ...) can be non-deterministic because they may be built with two different versions of intl/plural.c. in two otherwise identical builds. We may or may not re-generate the file plural.c from the file plural.y, based on bison being installed or not and based on mtimes of those two files, as the Makefile contains: plural.c: plural.y $(BISON) $(BISONFLAGS) $@ $^ If the above rule does not fire, we use a "fallback" plural.c, otherwise we use plural.c re-generated from plural.y. The fix is to always require bison to be installed and unconditionally re-generate plural.c. (This is achieved by touching plural.y). [YOCTO #12291] (From OE-Core rev: 112c6e77a81ec748cd116d1088dae2a1f59643f5) Signed-off-by: Juro Bystricky <juro.bystricky@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org> (cherry picked from commit b79eeb68c6ad7c92a3e54c6f97a8bf49f0098206) Signed-off-by: Armin Kuster <akuster808@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>