I am trying to call the lapack routine dgesv in the R distribution from the fortran code for a package, but when I dyn.load("dse1.so") I get an error about undefined symbol: dgesv_ I thought the proper incantation was MAKEFLAG="FLIBS=/path to/R-2.1.1/libRlapack.so" R CMD SHLIB dse1.f but apparantly not. How does one do this? Thanks, Paul