1 files changed, 19 insertions, 1 deletions
diff --git a/bpkg/package.ixx b/bpkg/package.ixx
index f6aa6c4..9c85407 100644
--- a/bpkg/package.ixx
+++ b/bpkg/package.ixx
@@ -1,5 +1,4 @@
 // file      : bpkg/package.ixx -*- C++ -*-
-// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
 namespace bpkg
@@ -12,4 +11,23 @@ namespace bpkg
         version (v)
   {
   }
+
+  template <typename T>
+  inline bool
+  has_buildfile_clause (const vector<T>& ds)
+  {
+    for (const dependency_alternatives& das: ds)
+    {
+      for (const dependency_alternative& da: das)
+      {
+        // Note: the accept clause cannot be present if the prefer clause is
+        // absent.
+        //
+        if (da.enable || da.reflect || da.prefer || da.require)
+          return true;
+      }
+    }
+
+    return false;
+  }
 }