cmake无法找到openssl

问题描述

我试图安装一个软件，它使用cmake安装本身，当我给在commandlin cmake。

它给我以下错误在这个文件，CMakeLists.txt ----- ---
line ---> find_package（OpenSSL REQUIRED）： -

I am trying to install a software, which uses cmake to install itself, when i give at commandlin cmake ..
it gives me following error in this file, CMakeLists.txt --------line ---> find_package(OpenSSL REQUIRED) :--

 cmake ..
-- Could NOT find Git (missing:  GIT_EXECUTABLE) 
ZLib include dirs: /usr/include
ZLib libraries: /usr/lib/arm-linux-gnueabihf/libz.so
Compiling with SSL support
CMake Error at /usr/local/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:97 (message):
  Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the
  system variable OPENSSL_ROOT_DIR (missing: OPENSSL_LIBRARIES
  OPENSSL_INCLUDE_DIR)
Call Stack (most recent call first):
  /usr/local/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:291 (_FPHSA_FAILURE_MESSAGE)
  /usr/local/share/cmake-2.8/Modules/FindOpenSSL.cmake:313 (find_package_handle_standard_args)
  CMakeLists.txt:436 (find_package)

这是文件CMakeLists.txt的一部分，其中错误是：------

Here is the part of file CMakeLists.txt, where error is comming :------

#
# OpenSSL
#
if (WITH_SSL)
    message("Compiling with SSL support")

    if (USE_CYASSL)
        # Use CyaSSL as OpenSSL replacement.
        # TODO: Add a find_package command for this also.
        message("CyaSSL include dir: ${CYASSL_INCLUDE_DIRS}")
        message("CyaSSL libraries: ${CYASSL_LIB}")

        # Additional to the root directory we need to include
        # the cyassl/ subdirectory which contains the OpenSSL
        # compatability layer headers.
        foreach(inc ${CYASSL_INCLUDE_DIRS})
            include_directories(${inc} ${inc}/cyassl)
        endforeach()

        list(APPEND LIB_LIST ${CYASSL_LIB})
    else()
        # TODO: Add support for STATIC also.
        find_package(OpenSSL REQUIRED)

        message("OpenSSL include dir: ${OPENSSL_INCLUDE_DIR}")
        message("OpenSSL libraries: ${OPENSSL_LIBRARIES}")

        include_directories(${OPENSSL_INCLUDE_DIR})
        list(APPEND LIB_LIST ${OPENSSL_LIBRARIES})
    endif()
endif(WITH_SSL)

现在我已安装Openssl，其中：----

http://www.opensource.apple.com/source/OpenSSL/OpenSSL-7.1/openssl/INSTALL?txt
Now i have installed Openssl, here :----

ssl header is here   -- > /usr/local/ssl/include/openssl/
ssl library is here  -- > /usr/local/ssl/lib/libssl.a
                          /usr/local/ssl/lib/libcrypto.a
openssl is here      -- > /usr/local/ssl/bin

我将.profile设置为：----

I have set my .profile as :----

export LD_LIBRARY_PATH=/usr/local/ssl/include/openssl:/usr/lib:/usr/local/lib:/usr/lib/pkgconfig:/usr/local/include/wx-2.8/wx:$LD_LIBRARY_PATH
export PKG_CONFIG_PATH=/usr/lib/pkgconfig
export OPENSSL_ROOT_DIR=/usr/local/ssl
export OPENSSL_LIBRARIES=/usr/local/ssl/lib/

PATH = /usr/local/ssl/bin:$PATH

如何解决此错误？

编辑： -

获取此错误

edit :--
Getting this error

/usr/local/lib/libcrypto.a(dso_dlfcn.o): In function `dlfcn_globallookup':
dso_dlfcn.c:(.text+0x10): undefined reference to `dlopen'
dso_dlfcn.c:(.text+0x24): undefined reference to `dlsym'
dso_dlfcn.c:(.text+0x30): undefined reference to `dlclose'

推荐答案

误解：CMake不需要环境变量来知道库和包含dir的位置是否是CMake变量。

It is a common misunderstanding: CMake does not need environment variables to know where the library and include dir are but CMake variables.

由于CMake找不到您的OpenSSL库和include目录，当你打电话时，必须手动告诉他他们在它的命令行。使用选项 -D 在命令行中设置CMake中的常量。您将需要设置常量 OPENSSL_ROOT_DIR 和 OPENSSL_LIBRARIES ，因为它们是触发错误的常量。

Since CMake can not find your OpenSSL lib and include directory, you will have to manually tell him where they are with its command line when you call it. Use the option -D to set constants in CMake from the command line. You will need to set the constants OPENSSL_ROOT_DIR and OPENSSL_LIBRARIES since they are the one triggering the error.

cmake -DOPENSSL_ROOT_DIR=/usr/local/ssl -DOPENSSL_LIBRARIES=/usr/local/ssl/lib

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