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-rw-r--r--examples/cxx/tree/polymorphism/makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/examples/cxx/tree/polymorphism/makefile b/examples/cxx/tree/polymorphism/makefile
index aadb79e..03107e2 100644
--- a/examples/cxx/tree/polymorphism/makefile
+++ b/examples/cxx/tree/polymorphism/makefile
@@ -36,7 +36,7 @@ genf := $(xsd:.xsd=.hxx) $(xsd:.xsd=.ixx) $(xsd:.xsd=.cxx)
gen := $(addprefix $(out_base)/,$(genf))
$(gen): xsd := $(out_root)/xsd/xsd
-$(gen): xsd_options := --generate-polymorphic --generate-serialization \
+$(gen): xsd_options += --generate-polymorphic --generate-serialization \
--root-element-last
$(gen): $(out_root)/xsd/xsd