Hello, I have 2 problems with R CMD SHLIB. The first problem didn't resolve, it just morphed into the new problem. I first have to admit that even though I've used R CMD SHLIB for a few years, I don't understand C compiling. The problem arose after our linux guy upgraded from Mandriva 2005 to Mandriva 2007. I was using R 2.4.1, but now it's upgraded to the current version. I used R CMD SHLIB to compile a C file that also linked to some fortran code. The error was something along the lines of not being able to find -lg2c. The gcc version I'm using is now 4.1.1, so our linux guy suggested the problem might be related to gfortran and f2c. I'm not sure... is this enough information to know what might be going on? So, I started looking around the FAQs online to try and figure out the problem and stumbled upon the R CMD COMPILE command. I ran it on my C and fortran code and didn't see any errors. I thought that was funny, so I erased the .o files it had created and tried again, with COMPILE and SHLIB... but now I get the error make: *** No rule to make target 'mhroc.o'. Stop. I have no idea what I did or how to correct it. Can anyone help? Thank you, Richard Zur