Red questions

• FFTW on Mac OS X Mavericks issues
• Error in OpenCV 2.4.2 "OpenCV Error: Bad flag"
• Speeding up rendering in SceneKit
• How do I access the webcam on a MacBook?
• SQL query for join table and multiple values
• Not assigning nil values to a hash
• Join table twice - on two different columns of the same table
• Dividing elements of a ruby array into an exact number of (nearly) equal-sized sub-arrays [duplicate]

Red answers