https://github.com/wch/r-source/search?l=fortran&p=1 https://github.com/wch/r-source/search?l=fortran&p=1 (https://github.com/wch/r-source https://github.com/w

https://github.com/wch/r-source/search?l=fortran&p=1 https://github.com/wch/r-source/search?l=fortran&p=1 (https://github.com/wch/r-source https://github.com/wch/r-source says that's 23% of the source. It includes vendored libraries, like a 5MB .f of LAPACK code. I bet a lot of the C code in R was f2c'd at some point in the past)