ODBC initialization issues

When I check ODBC.API.odbc_dm, I get

julia> using ODBC
julia> ODBC.API.odbc_dm
""

So it doesn’t seem to be finding anything. When I look in /usr/lib, I get

> cd /usr/lib
> ls *odbc*
libodbccr.so        libodbcinst.so        libodbc.so        psqlodbcw.so
libodbccr.so.2      libodbcinst.so.2      libodbc.so.2
libodbccr.so.2.0.0  libodbcinst.so.2.0.0  libodbc.so.2.0.0

tdbcodbc1.0.4:
libtdbcodbc1.0.4.so  pkgIndex.tcl  tdbcodbc.tcl

So the library is present. After using ODBC, I tried to set the library manually, using libodbc, libodbc.so and /usr/lib/libodbc.so. I get a warning about redefining constant odbc_dm that I’m not worried about, but if I try ODBC.listdrivers() or ODBC.listdsns(), I get

ERROR: UndefVarError: ENV not defined
 in listdrivers() at ~/.julia/v0.5/ODBC/src/ODBC.jl:72
 in eval_user_input(::Any, ::Base.REPL.REPLBackend) at ./REPL.jl:64
 in macro expansion at ./REPL.jl:95 [inlined]
 in (::Base.REPL.##3#4{Base.REPL.REPLBackend})() at ./event.jl:68

Do you have any other suggestions? Thanks again.