I want to add a MrSID layer to QGIS (version 2.6.1) with a computer running Mac OS X Yosemite. I installed QGIS through macports from the terminal and all python packages through macports, as well. I have been googling the problem and have tried to install all kinds of packages that MrSID may be dependent on, but it still doesn't work. This is the error it prompts:
"/Users/jordi_pages/Downloads/LT_LiDAR_Sample_Data/Dallas_11SDK.sid is not a supported raster data source"