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+Emscripten is a toolset which allows compiling C/C++ into JavaScript.
+
+
+If that does not scare you, read further.
+
+Emscripten used to work like a compiler-wrapper around gcc/g++/clang,
+and other tools, and doing that now is still possible, via a package
+called "emscripten" (not available at SBo). However, since the
+ambitions of the authors began to grow, more and more tools were
+becoming part of the Emscripten toolset, and it became more and more
+unwieldy installing all of them by hand.
+
+This package, emsdk, is a set of "blessed" shell scripts to do just
+that in a standardised fashion. It might be compared to an Android
+SDK manager, or MinGW installer.
+
+Activate it by sourcing /etc/profile.d/emsdk_env.sh , or run
+individual commands by emsdk <command>