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...nv) { ... F77_CALL(DGESV)(p, p, Ain, p, ipiv, Bin, p, &info); } In order to create the ".so" file to load in R I downloaded the dgesv.f file as well as the dependencies (dgetf2.f dgetrf.f dgetrs.f dlaswp.f). As I was used to I ran in a terminal R CMD COMPILE *.f R CMD SHLIB MY_C_FILE.c *.o to get the MY_C_FILE.so file. However, when I try to load it in a R session I get the following error message "undefined symbol: DGESV_". Similar errors are occurring with some other (old) C files that I was used to use a couple of years ago. In this connection I have to say that t...