I posted a question quite a while back about vsnprintf and Brian Ripley replied that R always makes sure it's available, so I needn't worry. A look at the source code shows the same for log1p and exp1m. But I am still confused. Right now my code compiles and runs fine when using the approved CFLAGS (no special gcc stuff), but when compiled with -ansi -pedantic it can't find these functions (because R itself was compiled with the default CFLAGS). That's no problem, except the last time I submitted a package it was kicked back because it didn't compile with -ansi -pedantic (which Writing R Extensions says it should). So what do I do? Or will there be no problem because KH tests with a version of R compiled with -ansi -pedantic so R not the C libraries is providing these functions? Pardon me if this is solved in 2.1.1 (I haven't looked there yet). -- Charles Geyer Professor, School of Statistics University of Minnesota charlie at stat.umn.edu