Fix for Ubuntu.

Makefile

@@ -10,7 +10,7 @@ CC=			gcc
 CXX=			g++ #-Wno-deprecated-declarations
 NVCC=			nvcc
 INCLUDES=		-I.
-CUDAWRAPPERS_LIBDIR=external/cuda-wrappers/build-${ARCH}/lib64
+CUDAWRAPPERS_LIBDIR=external/cuda-wrappers/build-${ARCH}
 CUDAWRAPPERS_INCLUDE=external/cuda-wrappers/include
 CUDAWRAPPERSFLAGS=		-Xlinker -rpath=${CUDAWRAPPERS_LIBDIR} ${CUDAWRAPPERS_LIBDIR}/cudawrappers-cu.so ${CUDAWRAPPERS_LIBDIR}/cudawrappers-nvrtc.so
 INCLUDES+=		-I$(CUDA_INCLUDE) -I${CUDAWRAPPERS_INCLUDE}