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-rw-r--r--src/treegen.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/treegen.h b/src/treegen.h
index 16c85cf0a..55da6f9e5 100644
--- a/src/treegen.h
+++ b/src/treegen.h
@@ -25,6 +25,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
class ManualMapVoxelManipulator;
class INodeDefManager;
+class ServerEnvironment;
namespace treegen {