fix build

Signed-off-by: Kim Kulling <[email protected]>

contrib/openddlparser/include/openddlparser/OpenDDLCommon.h

@@ -26,6 +26,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <cstddef>
 #include <vector>
+#include <string>
 
 #include <string.h>