Compiling with GIST

I have compiled postgres 1.8.5 on Windows XP from source using MinGW, however the GIST index cannot be created since the following errors pop up:

HINT: You must specify an operator class for the index or define a default operator class for the data type.
ERROR: data type character varying has no default operator class for access method "gist"

Do I have to create them one by one?

Thanks