LoadError: Cannot find or load libmxnet.dylib

Hi, I have performed the following steps:

1). built MXNet from source with GPU support which generated the following 2 files:

```
libmxnet.a
libmxnet.so
```

2). withing Julia 0.6.2, `Pkg.add("MXNet")`

```
julia> Pkg.add("MXNet")
INFO: Installing MXNet v0.3.0
INFO: Building MXNet
INFO: MXNET_HOME environment detected: /Users/conradwt/ai.dir/projects/mxnet
INFO: Trying to load existing libmxnet...
INFO: Failed to load existing libmxnet, trying to build from source...
INFO: Found a CUDA installation.
INFO: Found a CuDNN installation.
INFO: CUDA_HOME -> /usr/local/cuda
INFO: Unsure if we can build against mkl.
INFO: Attempting build anyway.
INFO: USE_JULIA_BLAS -> true
INFO: Package database updated
```

3). within Julia 0.6.2, `using MXNet`

```
julia> using MXNet
INFO: Precompiling module MXNet.
ERROR: LoadError: LoadError: Cannot find or load libmxnet.dylib. Please see the document on how to build it.
Stacktrace:
[1] error(::String) at ./error.jl:21
[2] include_from_node1(::String) at ./loading.jl:576
[3] include(::String) at ./sysimg.jl:14
[4] include_from_node1(::String) at ./loading.jl:576
[5] include(::String) at ./sysimg.jl:14
[6] anonymous at ./:2
while loading /Applications/JuliaPro-0.6.2.2.app/Contents/Resources/pkgs-0.6.2.2/v0.6/MXNet/src/base.jl, in expression starting on line 38
while loading /Applications/JuliaPro-0.6.2.2.app/Contents/Resources/pkgs-0.6.2.2/v0.6/MXNet/src/MXNet.jl, in expression starting on line 25
ERROR: Failed to precompile MXNet to /Applications/JuliaPro-0.6.2.2.app/Contents/Resources/pkgs-0.6.2.2/lib/v0.6/MXNet.ji.
Stacktrace:
[1] compilecache(::String) at ./loading.jl:710
[2] _require(::Symbol) at ./loading.jl:497
[3] require(::Symbol) at ./loading.jl:405
```

Note: `libmxnet.dylib` was not created but a `libmxnet.so` and `libmxnet.a` were created in step (1). Thus, I'm not sure why `using MXNet` is looking for a different file here.

Comment

Platform

- macOS 10.13.3
- Julia 0.6.2
- MXNet 1.1.0