[Mono-list] MySql.Data problems

[DevLOOP]

When I run:

gmcs -r:MySql.Data.dll helloworld.cs

I get:

helloworld.cs(9,8): error CS0246: The type or namespace name `IDbConnection'
could not be found. Are you missing an assembly reference?
helloworld.cs(10,20): error CS0012: The type `System.Data.Common.DbConnection'
is defined in an assembly that is not referenced. Consider adding a reference to
assembly `System.Data, Version=4.0.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089'
helloworld.cs(10,8): error CS0841: A local variable `dbcon' cannot be used
before it is declared
helloworld.cs(11,8): error CS0841: A local variable `dbcon' cannot be used
before it is declared
helloworld.cs(13,8): error CS0246: The type or namespace name `IDbCommand' could
not be found. Are you missing an assembly reference?
helloworld.cs(19,8): error CS0841: A local variable `dbcmd' cannot be used
before it is declared
helloworld.cs(20,8): error CS0246: The type or namespace name `IDataReader'
could not be found. Are you missing an assembly reference?
helloworld.cs(22,14): error CS0841: A local variable `reader' cannot be used
before it is declared
helloworld.cs(23,13): error CS0103: The name `Console' does not exist in the
current context
Compilation failed: 9 error(s), 0 warnings

-----------------

I thought I installed the component:  I downloaded the connector from mysql.com,
and ran:

gacutil -i -package 4.0 v4/MySql.Data.dll

(also, with "-package 4.5" and "-package 2.0")

and I can see the installed files:  /opt/mono-3.0.2/lib/mono/4.0/MySql.Data.dll
(a symlink to
/opt/mono-3.0.2/lib/mono/gac/MySql.Data/6.6.4.0__c5687fc88969c44d/MySql.Data.dll
)

and I also have:
/opt/mono-3.0.2/lib/mono/gac/MySql.Data/6.6.4.0__c5687fc88969c44d/MySql.Data.dll

What is missing or incorrect?

thanks