Update README.md

README.md

 # HPVM
 
+## Dependencies
+You would need to download and install the following components for using AVX and NVIDIA GPUs to speed up your programs
+
+* Intel OpenCL SDK for Linux from [software.intel.com/sdk/opencl](software.intel.com/sdk/opencl). Follow the installation instructions (no special requirements).
+* CUDA
+
 ## Build
 
 ```shell
 # Get dependencies
 cd llvm/projects
 git pull https://github.com/llvm-mirror/compiler-rt
-git checkout release_39
+git checkout release_40
 cd ../..
 
 # Build
+mkdir install
 mkdir build && cd build
-cmake ../llvm
-make -j
-```
+cmake ../llvm -DCMAKE_BUILD_TYPE=Debug -DLLVM_TARGETS_TO_BUILD="X86;NVPTX" -DCMAKE_INSTALL_PREFIX=../install
+make -j<number of threads you want to use to build hpvm>
+```
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