Hi Eugene, I run into some troubles with the digest package on Windows. On unix, digest binds to zlib, but on Windows, the relevant c files from zlib are included. However, in digest-0.0.0.4, two header files were missing which were needed for compilation on my machine. With these header files added (from digits-0.0.0.3), digest compiles fine. Unfortunately, the zlib package has the same approach of including c files from zlib on Windows. That means that I could not use both zlib and digest together, because they contained conflicting symbols. Unfortunately, pandoc requires both zlib and digest. I solved the problem by removing the cbits from digest, and instead require the zlib on Windows. In other words, I deleted the cbits subdirectory, and changed the last few lines of digest.cabal from if !os(windows) extra-libraries: z else c-sources: cbits/adler32.c cbits/crc32.c include-dirs: cbits install-includes: zlib.h to the following: if !os(windows) extra-libraries: z else build-depends: zlib With this change, everything seems to work fine for me. Tillmann