Portability notes for the Lepton implementation (https://github.com/dropbox/lepton https://github.com/dropbox/lepton): * Implemented in C++ (-std=c++0x and -st

Portability notes for the Lepton implementation (https://github.com/dropbox/lepton https://github.com/dropbox/lepton): * Implemented in C++ (-std=c++0x and -std=c++11 work, -std=c++98 doesn't work). * Needs a recent g++ to compile (g++-4.8 works, g++-4.4 doesn't work). * Runs on Linux and Windows. * Runs on i386 (-m32) and amd64 (-m64) architectures. Doesn't work on other architectures, because it uses SSE4.1 instructions. * Can be compiled without autotools (http://ptspts.blogspot.ch/2016/07/how-to-compile-lepton-jpeg-lossless.html http://ptspts.blogspot.ch/2016/07/how-to-compile-lepton-jpeg...).