Adding channel on build doesn't work

Author: hwpang

deps/build.jl

@@ -15,12 +15,5 @@ if !("rmg" in packages) && !("rmgmolecule" in packages)
     CondaPkg.add("pydot")
 end
 
-if "rmg" in packages
-    CondaPkg.add_channel("defaults")
-    CondaPkg.add_channel("rmg")
-    CondaPkg.add_channel("conda-forge")
-    CondaPkg.add_channel("cantera")
-end
-
 const Pkg = Base.require(Base.PkgId(Base.UUID("44cfe95a-1eb2-52ea-b672-e2afdf69b78f"), "Pkg"))
 Pkg.build("PythonCall")