rofl0r/proxychains-ng — pull request #35 by hexchain (2014-07-09 12:21:48+00:00)
Title: Preserve old environment variable values when preloading

When used with nonempty LD_PRELOAD, old value will be overwritten. This can cause problems when program is executed from special environment, e.g. optirun/primusrun (bumblebee) context which sets LD_PRELOAD and program using OpenGL will fail if the correct library is not preloaded.