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+ALLOW_DUPLICATE_CUSTOM_TARGETS
+------------------------------
+
+Allow duplicate custom targets to be created.
+
+Normally CMake requires that all targets built in a project have
+globally unique logical names (see policy CMP0002). This is necessary
+to generate meaningful project file names in Xcode and VS IDE
+generators. It also allows the target names to be referenced
+unambiguously.
+
+Makefile generators are capable of supporting duplicate custom target
+names. For projects that care only about Makefile generators and do
+not wish to support Xcode or VS IDE generators, one may set this
+property to true to allow duplicate custom targets. The property
+allows multiple add_custom_target command calls in different
+directories to specify the same target name. However, setting this
+property will cause non-Makefile generators to produce an error and
+refuse to generate the project.