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-rw-r--r--src/runtime/c/pgf/expr.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/runtime/c/pgf/expr.h b/src/runtime/c/pgf/expr.h
index 003102792..f4d5881c7 100644
--- a/src/runtime/c/pgf/expr.h
+++ b/src/runtime/c/pgf/expr.h
@@ -13,7 +13,7 @@
/// An abstract syntax tree
typedef GuVariant PgfExpr;
-GU_DECLARE_TYPE(PgfExpr, GuVariant);
+extern GU_DECLARE_TYPE(PgfExpr, GuVariant);
typedef GuList(PgfExpr) PgfExprs;