Hello, In order to build (cabal install HDBC-mysql) the HDBC-mysql package, I am having to make the following changes: (1) I had to change the mysql (5.1.45 community distrib msi) to use a wrapper exe on the mysql_config.pl and put this in c:\program files\mysql\bin since although the c:\program files\mysql\scripts\, where mysql_config.pl resides, was in the path, even the commandline call to it was not finding or using it...very strange. This of course doesn't directly have to do with the HDBC-mysql package. --The quick wrapper was: import System.Environment(getArgs) import System.Process(readProcessWithExitCode) import System.Exit(exitWith,ExitCode(ExitSuccess)) main = do args <- getArgs (ecode,out,err) <- readProcessWithExitCode "c:\\Perl64\\bin\\perl.exe" ("C:\\Program Files\\MySQL\\scripts\\mysql_config.pl" : args) "" if ecode == ExitSuccess then mapM_ putStrLn (lines out) else mapM_ putStrLn (lines err) exitWith ecode -- so now the output is: "C:\Program Files\MySQL\lib\mysqlclient.lib" "wsock32.lib" "advapi32.lib" "user3 2.lib" (2) Once that was done, the "cabal install HDBC-mysql" call was able to find the mysql_config. However, it was splitting the values returned by mysql_config on space, and thus failed to find mysql.h, as the resulting command was: C:\Program Files (x86)\Haskell Platform\2009.2.0.2\gcc.exe -c -BC:\ Program Files (x86)\Haskell Platform\2009.2.0.2\gcc-lib -IC:\Program Files (x86) \Haskell Platform\2009.2.0.2\include\mingw -D__GLASGOW_HASKELL__=610 -IIC:\Program -Iles\MySQL\include\mysql" ... -- then I tried taking the -I out of the mysql_config.pl script and got the following from the "cabal install HDBC-mysql" command was: C:\Program Files (x86)\Haskell Platform\2009.2.0.2\gcc.exe -c -BC:\ Program Files (x86)\Haskell Platform\2009.2.0.2\gcc-lib -IC:\Program Files (x86) \Haskell Platform\2009.2.0.2\include\mingw -D__GLASGOW_HASKELL__=610 -I:\Program -Iles\MySQL\include\mysql" ... blah blah blah cabal: Error: some packages failed to install: HDBC-mysql-0.6.1 failed during the building phase. The exception was: exit: ExitFailure 1 ... so finally I am downloading your package to see if I can figure out a fix for windows boxes. Just thought I would give you a heads up on this windows-related bug. Thanks, Roderick