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Install rcm

curl -LO https://thoughtbot.github.io/rcm/dist/rcm-1.3.1.tar.gz && \
sha=$(shasum -a 256 rcm-1.3.1.tar.gz | cut -f1 -d' ') && \
[ "$sha" = "9c8f92dba63ab9cb8a6b3d0ccf7ed8edf3f0fb388b044584d74778145fae7f8f" ] && \
tar -xvf rcm-1.3.1.tar.gz && \
cd rcm-1.3.1 && \
./configure  --prefix=$HOME/local  && \
make && \
make install