[CMake] cmake to download and compile fftw library

[aishwarya selvaraj]

Hi all,
I have written the below cmakelist.txt .



CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
PROJECT(PROSE)
################################################################

include(ExternalProject)
MESSAGE(STATUS "Trying to install fftw...")

ExternalProject_Add(project_fftw
  #GIT_REPOSITORY  https://github.com/FFTW/fftw3
  URL "http://www.fftw.org/fftw-3.3.2.tar.gz"
  PREFIX ${CMAKE_CURRENT_BINARY_DIR}/fftw
  CONFIGURE_COMMAND ""
    #--Build step-----------------
  BUILD_COMMAND ""
    #--Install step---------------
  UPDATE_COMMAND "" # Skip annoying updates for every build
  INSTALL_COMMAND ""
 )

ADD_LIBRARY(fftw INTERFACE)


TARGET_INCLUDE_DIRECTORIES(fftw INTERFACE
"${install_dir}/src/project_fftw/api/")


​ADD_EXECUTABLE(prose ${PROJECT_SOURCE_DIR}/src/read.cpp)
TARGET_LINK_LIBRARIES(prose fftw  )
​


​But when I run it in cygwin (windows) I get the following error:
*Scanning dependencies of target prose*
*[ 94%] Building CXX object CMakeFiles/prose.dir/src/read.cpp.o*
*/home/computing7/prose/src/read.cpp:17:19: fatal error: fftw3.h: No such
file or                                         directory*
*compilation terminated.*
*make[2]: *** [CMakeFiles/prose.dir/build.make:63:
CMakeFiles/prose.dir/src/read.
 cpp.o] Error 1*
*make[1]: *** [CMakeFiles/Makefile2:142: CMakeFiles/prose.dir/all] Error 2*
*make: *** [Makefile:84: all] Error 2*
​
​Could anyone please tell me on how to solve this problem .​

-- 
Regards,
Aishwarya Selvaraj
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