Unable to use Dgemm

I'm trying to use GEMM with double-precision floats, but that doesn't seem supported? I tried a straight-forward adaptation of the `clblasSgemm_future.jl` and `clblasSgemmRandomBufferFuture.jl` examples to use `Float64`/`cl.cl_double`, but I get the following errors.

```
$ julia clblasDgemm_future.jl
WARNING: float64(x::AbstractArray) is deprecated, use map(Float64,x) instead.
in depwarn at deprecated.jl:73
in float64 at deprecated.jl:50
in include at ./boot.jl:261
in include_from_node1 at ./loading.jl:304
in process_options at ./client.jl:308
in _start at ./client.jl:411
while loading /home/nstiurca/.julia/v0.4/CLBLAS/examples/clblasDgemm_future.jl, in expression starting on line 9
WARNING: float64(x::AbstractArray) is deprecated, use map(Float64,x) instead.
in depwarn at deprecated.jl:73
in float64 at deprecated.jl:50
in include at ./boot.jl:261
in include_from_node1 at ./loading.jl:304
in process_options at ./client.jl:308
in _start at ./client.jl:411
while loading /home/nstiurca/.julia/v0.4/CLBLAS/examples/clblasDgemm_future.jl, in expression starting on line 10
ERROR: LoadError: MethodError: `clblasDgemm` has no method matching clblasDgemm(::UInt32, ::UInt32, ::Float64, ::Array{Float64,2}, ::Array{Float64,2}, ::Float64, ::Array{Float64,2})
Closest candidates are:
clblasDgemm(::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Array{OpenCL.CmdQueue,1})
clblasDgemm(::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Array{OpenCL.CmdQueue,1}, !Matched::Union{Array{Ptr{Void},1},Void})
clblasDgemm(::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any)
in include at ./boot.jl:261
in include_from_node1 at ./loading.jl:304
in process_options at ./client.jl:308
in _start at ./client.jl:411
while loading /home/nstiurca/.julia/v0.4/CLBLAS/examples/clblasDgemm_future.jl, in expression starting on line 15
```

and

```
$ julia clblasDgemmRandomBufferFuture.jl
ERROR: LoadError: MethodError: `clblasDgemm` has no method matching clblasDgemm(::UInt32, ::UInt32, ::Float64, ::OpenCL.Buffer{Float64}, ::OpenCL.Buffer{Float64}, ::Float64, ::OpenCL.Buffer{Float64})
Closest candidates are:
clblasDgemm(::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Array{OpenCL.CmdQueue,1})
clblasDgemm(::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Array{OpenCL.CmdQueue,1}, !Matched::Union{Array{Ptr{Void},1},Void})
clblasDgemm(::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any)
in include at ./boot.jl:261
in include_from_node1 at ./loading.jl:304
in process_options at ./client.jl:308
in _start at ./client.jl:411
while loading /home/nstiurca/.julia/v0.4/CLBLAS/examples/clblasDgemmRandomBufferFuture.jl, in expression starting on line 26
```

I am using Linux Mint 17.2 (essentially Ubuntu 14.04), clBLAS v2.6, Julia v0.4, latest CLBLAS.jl master (currently 1555379).