Consistent nothing

src/dependencies.jl

@@ -495,7 +495,7 @@ function _find_library(dep::LibraryDependency; provider = Any)
     # Make sure we keep the defaults first, but also look in the other directories
     providers = unique([reduce(vcat,[getallproviders(dep,p) for p in defaults]);dep.providers])
     for (p,opts) in providers
-        (p != nothing && can_use(typeof(p)) && can_provide(p,opts,dep)) || continue
+        (p !== nothing && can_use(typeof(p)) && can_provide(p,opts,dep)) || continue
         paths = AbstractString[]
 
         # Allow user to override installation path
@@ -686,7 +686,7 @@ function viable_providers(deps::LibraryGroup)
             continue
         end
         providers = map(x->typeof(x[1]),dep.providers)
-        if vp == nothing
+        if vp === nothing
             vp = providers
         else
             vp = intersect(vp,providers)
@@ -1013,7 +1013,7 @@ macro load_dependencies(args...)
             end
         end)
     end
-    if arg1 != nothing && !isa(arg1,Function)
+    if arg1 !== nothing && !isa(arg1,Function)
         if !isempty(arg1)
             errrormsg = "The following required libraries were not declared in build.jl:\n"
             for k in (isa(arg1,Vector) ? arg1 : keys(arg1))