CMake not able to find OpenSSL library

Question

I am trying to install a software that uses cmake to install itself   When I run cmake    on the command line  it gives me following error in the CMakeLists txt on the line that says find package OpenSSL REQUIRED   -- 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   Here is the part of the file CMakeLists txt where the error is coming from      OpenSSL   if  WITH SSL      message  quot Compiling with SSL support quot        if  USE CYASSL            Use CyaSSL as OpenSSL replacement            TODO  Add a find package command for this also          message  quot CyaSSL include dir    CYASSL INCLUDE DIRS  quot           message  quot CyaSSL libraries    CYASSL LIB  quot              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  quot OpenSSL include dir    OPENSSL INCLUDE DIR  quot           message  quot OpenSSL libraries    OPENSSL LIBRARIES  quot            include directories   OPENSSL INCLUDE DIR           list APPEND LIB LIST   OPENSSL LIBRARIES       endif   endif WITH SSL   I have OpenSSL installed here  ssl header is here   --  gt   usr local ssl include openssl  ssl library is here  --  gt   usr local ssl lib libssl a                            usr local ssl lib libcrypto a openssl is here      --  gt   usr local ssl bin  I have in my  profile  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  How can I resolve this error  EDIT  Now I am 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

User · Answer

Please install openssl from below link  https   code google com p openssl-for-windows downloads list then set the variables below   OPENSSL ROOT DIR D  softwares visualStudio openssl-0 9 8k WIN32 OPENSSL INCLUDE DIR D  softwares visualStudio openssl-0 9 8k WIN32 include OPENSSL LIBRARIES D  softwares visualStudio openssl-0 9 8k WIN32 lib

User · Answer

you are having the FindOpenSSL cmake file in the cmake module path usr shared cmake-3 5 modules        Search OpenSSL   find package OpenSSL REQUIRED   if  OpenSSL FOUND       include directories   OPENSSL INCLUDE DIRS       link directories   OPENSSL LIBRARIES       message STATUS  Using OpenSSL   OPENSSL VERSION     target link libraries project name  path of libssl so  path of libcrypto so

User · Answer

sudo apt install libssl-dev works on ubuntu 18 04

User · Answer

If you re using Ubuntu  run sudo apt install libssl-dev

User · Answer

Just for fun ill post an alternative working answer for the OP s question   cmake -DOPENSSL ROOT DIR  usr local opt openssl  -DOPENSSL CRYPTO LIBRARY  usr local opt openssl lib

User · Answer

If you can use pkg-config  pkg search module   can find OpenSSL for you     Search OpenSSL find package PkgConfig REQUIRED  pkg search module OPENSSL REQUIRED openssl   if  OPENSSL FOUND       include directories   OPENSSL INCLUDE DIRS       message STATUS  Using OpenSSL   OPENSSL VERSION    else         Error  with REQUIRED  pkg search module   will throw an error by it s own endif    target link libraries   YOUR TARGET HERE    OPENSSL LIBRARIES

User · Answer

I had the same problem  openssl  and this worked for me on Ubuntu 14 04 1 LTS  The solution is the same up to Ubuntu 18 04  tested    sudo apt-get install libssl-dev

User · Answer

Just in case   this works for me  Sorry for specific version of OpenSSL  but might be desirable    On macOS  search Homebrew for keg-only versions of OpenSSL   equivalent of   -DOPENSSL ROOT DIR  usr local opt openssl  -DOPENSSL CRYPTO LIBRARY  usr local opt openssl lib  if  CMAKE HOST SYSTEM NAME MATCHES  quot Darwin quot       execute process          COMMAND brew --prefix OpenSSL          RESULT VARIABLE BREW OPENSSL         OUTPUT VARIABLE BREW OPENSSL PREFIX         OUTPUT STRIP TRAILING WHITESPACE           if  BREW OPENSSL EQUAL 0 AND EXISTS  quot   BREW OPENSSL PREFIX  quot           message STATUS  quot Found OpenSSL keg installed by Homebrew at   BREW OPENSSL PREFIX  quot           set OPENSSL ROOT DIR  quot   BREW OPENSSL PREFIX   quot           set OPENSSL INCLUDE DIR  quot   BREW OPENSSL PREFIX  include quot           set OPENSSL LIBRARIES  quot   BREW OPENSSL PREFIX  lib quot           set OPENSSL CRYPTO LIBRARY  quot   BREW OPENSSL PREFIX  lib libcrypto dylib quot       endif   endif         find package OpenSSL REQUIRED  if  OPENSSL FOUND      Add the include directories for compiling   target include directories   TARGET SERVER  PUBLIC   OPENSSL INCLUDE DIR       Add the static lib for linking   target link libraries   TARGET SERVER  OpenSSL  SSL OpenSSL  Crypto    message STATUS  quot Found OpenSSL   OPENSSL VERSION  quot   else     message STATUS  quot OpenSSL Not Found quot   endif

User · Answer

Note for Fedora 27 users  I had to install openssl-devel package to run the cmake successfully    sudo dnf install openssl-devel

User · Answer

Same problem  and fixed it on my centos 6 5 using the following command   yum install openssl-devel

User · Answer

Morwenn is right  You need to config the openssl DIR  Before that you may need to make sure you have it  you should check whether you have it  first run openssl version then if you have it you can win   r run openssl and you win find the core dir since it may not name as openssl in your system

User · Answer

fixed it on macOS using  brew install openssl cmake -DOPENSSL ROOT DIR  usr local opt openssl -DOPENSSL LIBRARIES  usr local opt openssl lib

User · Answer

This is what I added in the CMakeList txt  which worked      https   cmake org cmake help latest command find package html   in the above link  it states     quot In Module mode  CMake searches for a file called Find lt PackageName gt  cmake      The file is first searched in the CMAKE MODULE PATH  then among the Find     Modules provided by the CMake installation  If the file is found  it is    read and processed by CMake  It is responsible for finding the package     checking the version  and producing any needed messages  Some find-modules    provide limited or no support for versioning  check the module documentation  quot      FindOpenSSL cmake can be found in path to cmake Modules     https   cmake org cmake help latest module FindOpenSSL html    find package OpenSSL REQUIRED  if  OPENSSL FOUND      Add the include directories for compiling   target include directories   PROJECT NAME  PUBLIC   OPENSSL INCLUDE DIR        Add the static lib for linking   target link libraries   PROJECT NAME  OpenSSL  SSL OpenSSL  Crypto     message STATUS  quot Found OpenSSL   OPENSSL VERSION  quot    else      message STATUS  quot OpenSSL Not Found quot    endif

[openssl] CMake not able to find OpenSSL library

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