if (STATIC_BUILD OR NOT USE_SYSTEM_OPENSSL)
  SET(OPENSSL_SOURCES_DIR ${CMAKE_BINARY_DIR}/openssl-1.0.1g)
  DownloadPackage(
    "de62b43dfcd858e66a74bee1c834e959"
    "www.montefiore.ulg.ac.be/~jodogne/Orthanc/ThirdPartyDownloads/openssl-1.0.1g.tar.gz"
    "${OPENSSL_SOURCES_DIR}")

  if (NOT EXISTS "${OPENSSL_SOURCES_DIR}/include/PATCHED")
    if ("${CMAKE_HOST_SYSTEM_NAME}" STREQUAL "Windows")
      message("Patching the symbolic links")
      # Patch the symbolic links by copying the files
      file(GLOB headers "${OPENSSL_SOURCES_DIR}/include/openssl/*.h")
      foreach(header ${headers})
        message(${header})
        file(READ "${header}" symbolicLink)
        message(${symbolicLink})
        configure_file("${OPENSSL_SOURCES_DIR}/include/openssl/${symbolicLink}" "${header}" COPYONLY)
      endforeach()
      file(WRITE "${OPENSSL_SOURCES_DIR}/include/PATCHED")
    endif()
  endif()

  add_definitions(
    -DOPENSSL_THREADS
    -DOPENSSL_IA32_SSE2
    -DOPENSSL_NO_ASM
    -DOPENSSL_NO_DYNAMIC_ENGINE
    -DNO_WINDOWS_BRAINDEATH

    -DOPENSSL_NO_BF 
    -DOPENSSL_NO_CAMELLIA
    -DOPENSSL_NO_CAST 
    -DOPENSSL_NO_EC
    -DOPENSSL_NO_ECDH
    -DOPENSSL_NO_ECDSA
    -DOPENSSL_NO_EC_NISTP_64_GCC_128
    -DOPENSSL_NO_GMP
    -DOPENSSL_NO_GOST
    -DOPENSSL_NO_HW
    -DOPENSSL_NO_JPAKE
    -DOPENSSL_NO_IDEA
    -DOPENSSL_NO_KRB5 
    -DOPENSSL_NO_MD2 
    -DOPENSSL_NO_MDC2 
    -DOPENSSL_NO_MD4
    -DOPENSSL_NO_RC2 
    -DOPENSSL_NO_RC4 
    -DOPENSSL_NO_RC5 
    -DOPENSSL_NO_RFC3779
    -DOPENSSL_NO_SCTP
    -DOPENSSL_NO_STORE
    -DOPENSSL_NO_SEED
    -DOPENSSL_NO_WHIRLPOOL
    -DOPENSSL_NO_RIPEMD
    )

  include_directories(
    ${OPENSSL_SOURCES_DIR}
    ${OPENSSL_SOURCES_DIR}/crypto
    ${OPENSSL_SOURCES_DIR}/crypto/asn1
    ${OPENSSL_SOURCES_DIR}/crypto/modes
    ${OPENSSL_SOURCES_DIR}/crypto/evp
    ${OPENSSL_SOURCES_DIR}/include
    )

  set(OPENSSL_SOURCES_SUBDIRS
    ${OPENSSL_SOURCES_DIR}/crypto
    ${OPENSSL_SOURCES_DIR}/crypto/aes
    ${OPENSSL_SOURCES_DIR}/crypto/asn1
    ${OPENSSL_SOURCES_DIR}/crypto/bio
    ${OPENSSL_SOURCES_DIR}/crypto/bn
    ${OPENSSL_SOURCES_DIR}/crypto/buffer
    ${OPENSSL_SOURCES_DIR}/crypto/cmac
    ${OPENSSL_SOURCES_DIR}/crypto/cms
    ${OPENSSL_SOURCES_DIR}/crypto/comp
    ${OPENSSL_SOURCES_DIR}/crypto/conf
    ${OPENSSL_SOURCES_DIR}/crypto/des
    ${OPENSSL_SOURCES_DIR}/crypto/dh
    ${OPENSSL_SOURCES_DIR}/crypto/dsa
    ${OPENSSL_SOURCES_DIR}/crypto/dso
    ${OPENSSL_SOURCES_DIR}/crypto/engine
    ${OPENSSL_SOURCES_DIR}/crypto/err
    ${OPENSSL_SOURCES_DIR}/crypto/evp
    ${OPENSSL_SOURCES_DIR}/crypto/hmac
    ${OPENSSL_SOURCES_DIR}/crypto/lhash
    ${OPENSSL_SOURCES_DIR}/crypto/md5
    ${OPENSSL_SOURCES_DIR}/crypto/modes
    ${OPENSSL_SOURCES_DIR}/crypto/objects
    ${OPENSSL_SOURCES_DIR}/crypto/ocsp
    ${OPENSSL_SOURCES_DIR}/crypto/pem
    ${OPENSSL_SOURCES_DIR}/crypto/pkcs12
    ${OPENSSL_SOURCES_DIR}/crypto/pkcs7
    ${OPENSSL_SOURCES_DIR}/crypto/pqueue
    ${OPENSSL_SOURCES_DIR}/crypto/rand
    ${OPENSSL_SOURCES_DIR}/crypto/rsa
    ${OPENSSL_SOURCES_DIR}/crypto/sha
    ${OPENSSL_SOURCES_DIR}/crypto/srp
    ${OPENSSL_SOURCES_DIR}/crypto/stack
    ${OPENSSL_SOURCES_DIR}/crypto/ts
    ${OPENSSL_SOURCES_DIR}/crypto/txt_db
    ${OPENSSL_SOURCES_DIR}/crypto/ui
    ${OPENSSL_SOURCES_DIR}/crypto/x509
    ${OPENSSL_SOURCES_DIR}/crypto/x509v3
    ${OPENSSL_SOURCES_DIR}/ssl
    )

  foreach(d ${OPENSSL_SOURCES_SUBDIRS})
    AUX_SOURCE_DIRECTORY(${d} OPENSSL_SOURCES)
  endforeach()

  list(REMOVE_ITEM OPENSSL_SOURCES
    ${OPENSSL_SOURCES_DIR}/crypto/LPdir_unix.c
    ${OPENSSL_SOURCES_DIR}/crypto/LPdir_vms.c
    ${OPENSSL_SOURCES_DIR}/crypto/LPdir_win.c
    ${OPENSSL_SOURCES_DIR}/crypto/LPdir_win32.c
    ${OPENSSL_SOURCES_DIR}/crypto/LPdir_wince.c
    ${OPENSSL_SOURCES_DIR}/crypto/armcap.c
    ${OPENSSL_SOURCES_DIR}/crypto/bf/bfs.cpp
    ${OPENSSL_SOURCES_DIR}/crypto/bio/bss_rtcp.c
    ${OPENSSL_SOURCES_DIR}/crypto/bn/exp.c
    ${OPENSSL_SOURCES_DIR}/crypto/conf/cnf_save.c
    ${OPENSSL_SOURCES_DIR}/crypto/conf/test.c
    ${OPENSSL_SOURCES_DIR}/crypto/des/des.c
    ${OPENSSL_SOURCES_DIR}/crypto/des/des3s.cpp
    ${OPENSSL_SOURCES_DIR}/crypto/des/des_opts.c
    ${OPENSSL_SOURCES_DIR}/crypto/des/dess.cpp
    ${OPENSSL_SOURCES_DIR}/crypto/des/read_pwd.c
    ${OPENSSL_SOURCES_DIR}/crypto/des/speed.c
    ${OPENSSL_SOURCES_DIR}/crypto/evp/e_dsa.c
    ${OPENSSL_SOURCES_DIR}/crypto/evp/m_ripemd.c
    ${OPENSSL_SOURCES_DIR}/crypto/lhash/lh_test.c
    ${OPENSSL_SOURCES_DIR}/crypto/md5/md5s.cpp
    ${OPENSSL_SOURCES_DIR}/crypto/pkcs7/bio_ber.c
    ${OPENSSL_SOURCES_DIR}/crypto/pkcs7/pk7_enc.c
    ${OPENSSL_SOURCES_DIR}/crypto/ppccap.c
    ${OPENSSL_SOURCES_DIR}/crypto/rand/randtest.c
    ${OPENSSL_SOURCES_DIR}/crypto/s390xcap.c
    ${OPENSSL_SOURCES_DIR}/crypto/sparcv9cap.c
    ${OPENSSL_SOURCES_DIR}/crypto/x509v3/tabtest.c
    ${OPENSSL_SOURCES_DIR}/crypto/x509v3/v3conf.c
    ${OPENSSL_SOURCES_DIR}/ssl/ssl_task.c
    ${OPENSSL_SOURCES_DIR}/crypto/LPdir_nyi.c
    ${OPENSSL_SOURCES_DIR}/crypto/aes/aes_x86core.c
    ${OPENSSL_SOURCES_DIR}/crypto/bio/bss_dgram.c
    ${OPENSSL_SOURCES_DIR}/crypto/bn/bntest.c
    ${OPENSSL_SOURCES_DIR}/crypto/bn/expspeed.c
    ${OPENSSL_SOURCES_DIR}/crypto/bn/exptest.c
    ${OPENSSL_SOURCES_DIR}/crypto/engine/enginetest.c
    ${OPENSSL_SOURCES_DIR}/crypto/evp/evp_test.c
    ${OPENSSL_SOURCES_DIR}/crypto/hmac/hmactest.c
    ${OPENSSL_SOURCES_DIR}/crypto/md5/md5.c
    ${OPENSSL_SOURCES_DIR}/crypto/md5/md5test.c
    ${OPENSSL_SOURCES_DIR}/crypto/o_dir_test.c
    ${OPENSSL_SOURCES_DIR}/crypto/pkcs7/dec.c
    ${OPENSSL_SOURCES_DIR}/crypto/pkcs7/enc.c
    ${OPENSSL_SOURCES_DIR}/crypto/pkcs7/sign.c
    ${OPENSSL_SOURCES_DIR}/crypto/pkcs7/verify.c
    ${OPENSSL_SOURCES_DIR}/crypto/rsa/rsa_test.c
    ${OPENSSL_SOURCES_DIR}/crypto/sha/sha.c
    ${OPENSSL_SOURCES_DIR}/crypto/sha/sha1.c
    ${OPENSSL_SOURCES_DIR}/crypto/sha/sha1t.c
    ${OPENSSL_SOURCES_DIR}/crypto/sha/sha1test.c
    ${OPENSSL_SOURCES_DIR}/crypto/sha/sha256t.c
    ${OPENSSL_SOURCES_DIR}/crypto/sha/sha512t.c
    ${OPENSSL_SOURCES_DIR}/crypto/sha/shatest.c
    ${OPENSSL_SOURCES_DIR}/crypto/srp/srptest.c

    ${OPENSSL_SOURCES_DIR}/crypto/bn/divtest.c
    ${OPENSSL_SOURCES_DIR}/crypto/bn/bnspeed.c
    ${OPENSSL_SOURCES_DIR}/crypto/des/destest.c
    ${OPENSSL_SOURCES_DIR}/crypto/dh/p192.c
    ${OPENSSL_SOURCES_DIR}/crypto/dh/p512.c
    ${OPENSSL_SOURCES_DIR}/crypto/dh/p1024.c
    ${OPENSSL_SOURCES_DIR}/crypto/des/rpw.c
    ${OPENSSL_SOURCES_DIR}/ssl/ssltest.c
    ${OPENSSL_SOURCES_DIR}/crypto/dsa/dsagen.c
    ${OPENSSL_SOURCES_DIR}/crypto/dsa/dsatest.c
    ${OPENSSL_SOURCES_DIR}/crypto/dh/dhtest.c
    ${OPENSSL_SOURCES_DIR}/crypto/pqueue/pq_test.c
    ${OPENSSL_SOURCES_DIR}/crypto/des/ncbc_enc.c
    )

  if ("${CMAKE_SYSTEM_NAME}" STREQUAL "Windows")
    set_source_files_properties(
      ${OPENSSL_SOURCES}
      PROPERTIES COMPILE_DEFINITIONS
      "OPENSSL_SYSNAME_WIN32;SO_WIN32;WIN32_LEAN_AND_MEAN;L_ENDIAN")

  elseif ("${CMAKE_SYSTEM_VERSION}" STREQUAL "LinuxStandardBase")
    execute_process(
      COMMAND patch ui_openssl.c ${CMAKE_SOURCE_DIR}/Resources/Patches/openssl-lsb.diff
      WORKING_DIRECTORY ${OPENSSL_SOURCES_DIR}/crypto/ui
      )

  endif()

  #add_library(OpenSSL STATIC ${OPENSSL_SOURCES})
  #link_libraries(OpenSSL)

else()
  include(FindOpenSSL)

  if (NOT ${OPENSSL_FOUND})
    message(FATAL_ERROR "Unable to find OpenSSL")
  endif()

  include_directories(${OPENSSL_INCLUDE_DIR})
  link_libraries(${OPENSSL_LIBRARIES})
endif()