Merge branch 'master', remote-tracking branch 'upstream/master'
conf-* pkg to explicit dependency to the lib curl
conf-* pkg to explicit dependency to the lib ffi
conf-* pkg to explicit dependency to the lib pcre
conf-* pkg to explicit dependency to the lib glew
conf-* pkg to explicit dependency to the lib ftgl
conf-* pkg to explicit dependency to the lib png
conf-* pkg to explicit dependency to the lib gsl
conf-* pkg to explicit dependency to the lib expat
conf-* pkg to explicit dependency to the lib lua
conf-* pkg to explicit dependency to the lib cairo
removed doubled name
Merge pull request #981 from blue-prawn/master

added conf-* pkgs to explicit dependency to some C libs