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When using $(top_builddir) inconsistently, Make (including GNU Make) is sometimes confused. As a result it may want to build lib/libbison.la and $(top_builddir)/lib/libbison.la (the same file, different names) concurrently, which, amusingly enough, might end with: ranlib lib/libbison.a ranlib lib/libbison.a make[2]: *** [lib/libbison.a] Segmentation fault on OS X. * doc/local.mk, src/local.mk: Do not use $(top_builddir) when not needed.