Hi Everyone: I spoke to marc schwartz privately about my problem and he
suggested using "make clean" to clear out my original configure results
from before I ran the configure command using the --enable-R-shlib. So I
ran that and started over and fortunately that solved my problem.  So I was
able to build R from source and include the shared library option. And
Rstudio works now also. Thanks to Marc and whomever else read about my
confusion !!!!!

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