Minor change to avoid errors from some versions of cmake.

e44da577 · Davis King · 48c68f21 · e44da577
Commit e44da577 authored Jun 28, 2017 by Davis King
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CMakeLists.txt dlib/cmake_utils/test_for_cudnn/CMakeLists.txt +4 -3

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--- a/dlib/cmake_utils/test_for_cudnn/CMakeLists.txt
+++ b/dlib/cmake_utils/test_for_cudnn/CMakeLists.txt
@@ -10,6 +10,7 @@ add_definitions(-DDLIB_USE_CUDA)

 include(find_cudnn.txt)

-include_directories(${cudnn_include})
-
-cuda_add_library(cudnn_test STATIC ../../dnn/cudnn_dlibapi.cpp ${cudnn} )
+if (cudnn_include AND cudnn)
+   include_directories(${cudnn_include})
+   cuda_add_library(cudnn_test STATIC ../../dnn/cudnn_dlibapi.cpp ${cudnn} )
+endif()