Improve 1.0 error messages around not-found dependencies - fixes #5135

lib/cocoapods/resolver.rb

@@ -420,11 +420,14 @@ module Pod
           elsif !conflict.existing
             conflict.requirements.values.flatten.each do |r|
               if search_for(r).empty?
-                # There is no existing specification inside any of the spec repos with given requirements.
-                message << "\n\nNone of the spec sources contain a spec satisfying the `#{r}` dependency." \
-                  "\nYou have either; mistyped the name or version," \
-                  ' not added the source repo that hosts the Podspec to your Podfile,' \
-                  ' or not got the latest versions of your source repos.'
+                # There are no existing specification inside any of the spec repos with given requirements.
+                message << "\n\nNone of your spec sources contain a spec satisfying the  dependency: `#{r}`." \
+                  "\n\nYou have either:" \
+                  "\n * out-of-date source repos which you can update with `pod repo update`."
+                  "\n * mistyped the name or version." \
+                  "\n * not added the source repo that hosts the Podspec to your Podfile." \
+                  "\n\nNote: as of CocoaPods 1.0, `pod repo update` does not happen on `pod install` by default."
+
               else
                 message << "\n\nSpecs satisfying the `#{r}` dependency were found, " \
                   'but they required a higher minimum deployment target.'