+single : DEF = -DREAL=0
+single : $(BIN)
+
+double : DEF = -DREAL=1
+double : $(BIN)
+
+# The tests will compile with the default REAL definition
+# To change that you can run as `make DEFS="REAL=X" tests/<target>` where X is your chosen type
+# But remember to make clean first.