Binarybuild installation fails on macOS

[evetion]

GDAL doesn't install on macOS, failing on the building part.

julia> Pkg.build("GDAL")
INFO: Building CodecZlib
INFO: Building Proj4
INFO: Building LibGEOS
INFO: Building GDAL
==================================================================================================[ ERROR: GDAL ]===================================================================================================

LoadError: BinaryProvider.LibraryProduct(nothing, String["libgdal"], :libgdal, "Prefix(/Users/epta/.julia/v0.6/GDAL/deps/usr)") is not satisfied, cannot generate deps.jl!
while loading /Users/epta/.julia/v0.6/GDAL/deps/build.jl, in expression starting on line 56

====================================================================================================================================================================================================================

The problem lies in the binary build, the libgdal.dylib cannot be loaded because its depencies cannot be found. The following lines prevent it for Linux, but not for macOS: https://github.com/JuliaGeo/GDAL.jl/blob/master/deps/build.jl#L46

julia> Libdl.dlopen("libgdal")
ERROR: could not load library "libgdal"
dlopen(libgdal.dylib, 1): Library not loaded: @rpath/libproj.12.dylib
  Referenced from: /Users/epta/.julia/v0.6/GDAL/deps/usr/lib/libgdal.20.dylib
  Reason: image not found
Stacktrace:
 [1] dlopen(::String, ::UInt32) at ./libdl.jl:97 (repeats 2 times)

[visr]

Hmm I wonder why it's working on OSX Travis but not for you locally. In any case I'm updating the builders to run with the latest BinaryBuilder which might bring along some rpath related fixes. Hope that will help here.

[evetion]

This is fixed for me by #52