Hi Martin,
I downloaded the source DirichletMultinomial_1.16.0.tar.gz and try to build the package on Windows. The package needs GSL, so I instralled GSL on Cygwin64. `gsl-config` works well in Cygwin terminal.
I tried to build by Rstudio and R CMD build command but both failed.
How did you configure GSL on your Windows platform?
I asked this question because I also need include GSL into my package. It works well on Linux but not so straightforward on Windows.