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We need to append-to rather than set CXXFLAGS, otherwise we loose -O2 & -pipe. Currently this results in zeromq being built without optimizations at all (or whatever the compiler would default too, essentially always -O0). Bdb is the same, for the CXX portion of its code. C code has been built with -O2. Boost has actually been uneffected because it receives -O3 from it's own build flags.