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diff --git a/src/structs.h b/src/structs.h
index 0d16ff8..62366ad 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -16,6 +16,8 @@ enum ToolType { TTNone, TTLine, TTCircle, TTEllipse, TTArc, TTDimension, TTText,
 
 enum ToolState { TSNone, TSPoint1, TSPoint2, TSPoint3, TSPoint4, TSDone };
 
+enum BasicUnit { BUInch = 0, BUFoot, BUYard, BUMile, BUMM, BUCM, BUM, BUKM, BUCount };
+
 const char objName[OTCount][16] = {
 	"None", "Line", "Circle", "Ellipse", "Arc", "Polygon", "Dimension",
 	"Spline", "Text", "Container"
@@ -25,6 +27,12 @@ const char dimName[DTCount][32] = {
 	"Circumferential", "Angular", "Leader"
 };
 
+const char buShortName[BUCount][8] = {
+	"in", "ft", "yd", "mi", "mm", "cm", "m", "km"
+};
+
+const double buInInches[BUCount] = { 1.0, 12.0, 36.0, 1.0/25.4, 1.0/2.54, 1.0/0.0254, 1.0/0.0000254 };
+
 #define OBJECT_COMMON \
 	int type;         \
 	uint32_t id;      \