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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Could not find FFTW3 at the configuration stage with Intel MKL used for the CPU backend","articleBody":"Hello there,\n\nI've ran into a problem configuring Arrayfire's CPU backend to use Intel's MKL, and here is the output from CMake:\n\n```\nCMake Warning at CMakeLists.txt:92 (MESSAGE):\n  Building With NONFREE ON requires the following patents\n\n\nCMake Warning at CMakeLists.txt:102 (MESSAGE):\n  Building with SIFT requires the following patents\n\n\nMethod and apparatus for identifying scale invariant featuresin an image and use of same for locating an object in an image,\" DavidG. Lowe, US Patent 6,711,293 (March 23, 2004). Provisional applicationfiled March 8, 1999. Asignee: The University of British Columbia. Forfurther details, contact David Lowe (lowe@cs.ubc.ca) or theUniversity-Industry Liaison Office of the University of BritishColumbia.\nChecking for module 'cblas'\n  No package 'cblas' found\nChecking for [mkl_rt]\nIncludes found\nCBLAS Symbols FOUND\nCBLAS library found\nCPU Backend Using MKL RT\nCMake Error at /usr/local/share/cmake-3.6/Modules/FindPackageHandleStandardArgs.cmake:148 (message):\n  Could NOT find FFTW (missing: FFTW_INCLUDES FFTW_LIBRARIES)\nCall Stack (most recent call first):\n  /usr/local/share/cmake-3.6/Modules/FindPackageHandleStandardArgs.cmake:388 (_FPHSA_FAILURE_MESSAGE)\n  CMakeModules/FindFFTW.cmake:110 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)\n  src/backend/cpu/CMakeLists.txt:58 (FIND_PACKAGE)\n\n\nConfiguring incomplete, errors occurred!\nSee also \"/home/lin/source.build/GPGPU/arrayfire/build/CMakeFiles/CMakeOutput.log\".\nSee also \"/home/lin/source.build/GPGPU/arrayfire/build/CMakeFiles/CMakeError.log\".\n```\n\nAnd attached below are the CMake logs (secret gists)\n1. [CMakeOutput.log](https://gist.github.com/Brainiarc7/f566d5b8bfc159c1f0fa3bf4707f76c2)\n2. [CMakeError.log](https://gist.github.com/Brainiarc7/d1f8b27098bef2831122dc09c4da6d95)\n\nPlatform used: Ubuntu 16.04 LTS\n","author":{"url":"https://github.com/Brainiarc7","@type":"Person","name":"Brainiarc7"},"datePublished":"2016-07-23T14:09:01.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/1514/arrayfire/issues/1514"}