[RogerL]

This is still true. This library uses Eigen, that one uses Boost, the other one uses a home grown one. And then you want to use another library, it uses Eigen (yay!), but an old version of Eigen and it won't compile against the current version.

C++ really crippled itself in this regard by never making a standard. I never bought Stroustrup's claims of "but you can write your own" for these reasons.