diff --git a/build/srcroot.go b/build/srcroot.go
new file mode 100644
index 00000000..6a2958b2
--- /dev/null
+++ b/build/srcroot.go
@@ -0,0 +1,14 @@
+package blst
+
+import (
+    "path/filepath"
+    "runtime"
+)
+
+var SrcRoot string
+
+func init() {
+    if _, self, _, ok := runtime.Caller(0); ok {
+        SrcRoot = filepath.Dir(filepath.Dir(self))
+    }
+}