Does your mistake mean that R was not created with --enable-R-shlib or that there are difficulties finding R to configure. Have you also updated / reinstalled / rebuilt R somewhere in this process? In the terminal, the output of the following commands:
echo $R_HOME
and
ls $R_HOME/lib
Presumably the first one shows /Library/Frameworks/R.framework/Resources, which matches where rpy install is looking for, but do you have libR.dylib available in the second?
If not, have you tried reinstalling R?
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