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README.md

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 # mpi_test
 
 Various standalone MPI binaries, either tests or examples depending on your perspective.
-The goal is to compile with no warnings with `-Wall -Wextra -Wshadow -pedantic` or similarly picky settings.
-
-Adjust `Makefile` to match your environment, if needed
-* uses `mpicxx` and a few simple flags by default
 
 ## Build
 ```
+mkdir build && cd build
+cmake ..
 make
 ```