Hi all, I tried using a database via haskell. The following simple test program could not be compiled via 'ghc Main.hs'. The output of ghc is: Main.o: In function `s1pB_info': (.text+0x6e): undefined reference to `HDBCzmpostgresqlzm2zi2zi3zi3_DatabaseziHDBCziPostgreSQLziConnectionImpl_zdfIConnectionConnection_closure' Main.o: In function `s1qt_info': (.text+0x169): undefined reference to `HDBCzmpostgresqlzm2zi2zi3zi3_DatabaseziHDBCziPostgreSQLziConnection_connectPostgreSQL_closure' Main.o: In function `s1qt_info': (.text+0x279): undefined reference to `__stginit_HDBCzm2zi2zi7zi0_DatabaseziHDBC_' Main.o: In function `s1qt_info': (.text+0x283): undefined reference to `__stginit_HDBCzmpostgresqlzm2zi2zi3zi3_DatabaseziHDBCziPostgreSQL_' Main.o: In function `s1pB_info': (.text+0x76): undefined reference to `HDBCzm2zi2zi7zi0_DatabaseziHDBCziTypes_disconnect_info' Main.o: In function `s1pC_srt': (.data+0x4): undefined reference to `HDBCzmpostgresqlzm2zi2zi3zi3_DatabaseziHDBCziPostgreSQLziConnectionImpl_zdfIConnectionConnection_closure' Main.o: In function `s1qt_srt': (.data+0x14): undefined reference to `HDBCzmpostgresqlzm2zi2zi3zi3_DatabaseziHDBCziPostgreSQLziConnection_connectPostgreSQL_closure' collect2: ld returned 1 exit status Is this a bug? Or do I need to modify the configuration of my system? If I load that module into ghci (':l Main') the compilation succeeds. % ghc --version: 'The Glorious Glasgow Haskell Compilation System, version 6.12.1' % psql --version: 'psql (PostgreSQL) 8.4.8 contains support for command-line editing' I also wanted to try out MySQL. I stranded much earlier: % cabal install database-hdbc-mysql: There is no such package, but shouldn't there be one? module Main where import Database.HDBC import Database.HDBC.PostgreSQL(connectPostgreSQL) main :: IO () main = do c <- connectPostgreSQL "host=localhost dbname=haskell user=gary password=wasauchimmer" disconnect c return () I would be glad about help! Greets Gary