diff --git a/circle.yml b/circle.yml
index f18e5345c..9fc449176 100644
--- a/circle.yml
+++ b/circle.yml
@@ -4,7 +4,7 @@ machine:
 
 dependencies:
   pre:
-    - cd /usr/local && sudo rm -rf go && curl https://storage.googleapis.com/golang/go1.4.2.linux-amd64.tar.gz | sudo tar -xz && sudo chmod a+w go/src/path/filepath
+    - cd /usr/local && sudo rm -rf go && curl https://storage.googleapis.com/golang/go1.5beta1.linux-amd64.tar.gz | sudo tar -xz && sudo chmod a+w go/src/path/filepath
   post:
     - npm install --global node-gyp
     - cd node-syscall && node-gyp rebuild && mkdir -p ~/.node_libraries/ && cp build/Release/syscall.node ~/.node_libraries/syscall.node
diff --git a/compiler/natives/runtime/pprof/pprof.go b/compiler/natives/runtime/pprof/pprof.go
index 9d2d03f89..962f7cd19 100644
--- a/compiler/natives/runtime/pprof/pprof.go
+++ b/compiler/natives/runtime/pprof/pprof.go
@@ -33,3 +33,6 @@ func WriteHeapProfile(w io.Writer) error {
 func Lookup(name string) *Profile {
 	return nil
 }
+
+func StartTrace(w io.Writer) error { return nil }
+func StopTrace()                   {}
diff --git a/compiler/natives/runtime/runtime.go b/compiler/natives/runtime/runtime.go
index 83e66cfeb..de102f274 100644
--- a/compiler/natives/runtime/runtime.go
+++ b/compiler/natives/runtime/runtime.go
@@ -166,3 +166,7 @@ func Stack(buf []byte, all bool) int {
 func LockOSThread() {}
 
 func UnlockOSThread() {}
+
+func Version() string {
+	return theVersion
+}
diff --git a/compiler/natives/time/time.go b/compiler/natives/time/time.go
index 403905b33..b3a0fd958 100644
--- a/compiler/natives/time/time.go
+++ b/compiler/natives/time/time.go
@@ -3,6 +3,7 @@
 package time
 
 import (
+	"errors"
 	"strings"
 
 	"github.com/gopherjs/gopherjs/js"
@@ -71,3 +72,7 @@ func stopTimer(t *runtimeTimer) bool {
 	t.active = false
 	return wasActive
 }
+
+func loadLocation(name string) (*Location, error) {
+	return nil, errors.New("unknown time zone " + name)
+}