* Incorporate as a patch upstream commit 0c20dbf059 (diff-acb9169b4ccbac494ced5140d285a015) resolving problems with `-Wno-...` options not being understood by GCC.
* Incorporate as a patch upstream PR https://github.com/ericniebler/range-v3/pull/1202 fixing upstream issue https://github.com/ericniebler/range-v3/issues/1196.
* Compile tests only if we actually want to run them.
* Optionally compile documentation with a `+doc` variant.
* Add `+examples` and `+perf` variants to avoid unnecessary compilation of components usually not required for install.
* Add conditional build-only dependency on Boost when appropriate.
* Install docs, examples and performance tests if built (not part of upstream build instructions).
* Add @chissg as a maintainer.
0c1496896d