-with Impact, try preloading libusb-driver-trenz.so instead of libusb-driver.so.
-It includes a hack by Stefan Ziegenbalg to force detection of a parallel cable.
+with Impact, try adding -DFORCE_PC3_IDENT to the CFLAGS line in the Makefile.
+This enables a hack by Stefan Ziegenbalg to force detection of a parallel cable.