Linking error -- openSSL to libcurl - cmake

Question

I'm doing C++ using libcURL. I got the task to test functions in Travis CI. So I used .travis.yml to get libcurl-dev and libssl-dev to connect to the project. I installed them and checked cURL configuration:
SSL support: enabled (OpenSSL)
But as I was trying to make main test file i got list of errors (example)
`Linking CXX executable ../bin/TechProject_example
/usr/local/lib/libcurl.a(libcurl_la-openssl.o): In function ossl_recv:
openssl.c:(.text+0xf3): undefined reference to ERR_clear_error
openssl.c:(.text+0x11c): undefined reference to SSL_read
openssl.c:(.text+0x163): undefined reference to SSL_get_error`
and so on...
The only thing I was able to check is that libcurl is working properly. I placed
--without-ssl flag and got protocol error.
Also I used
`- sudo ln -fs /usr/lib/libcurl.so.4 /usr/local/lib/`
to avoid cmake error. (I'm not very good at UNIX command, so this can be a problem)
So how should properly connect openSSL to C++ project that has <curl/curl.h> ?
EDIT:
Here is CMakeLists.txt:
cmake_minimum_required(VERSION 2.8)
project (TechProject)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
set(HEADERS ${PROJECT_SOURCE_DIR}/include/testclass.h)
set(HEADERS ${PROJECT_SOURCE_DIR}/include/catch.hpp)
set(SOURCES ${PROJECT_SOURCE_DIR}/sources/testclass.cpp)
set(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/bin)
set(LIBRARY_OUTPUT_PATH ${PROJECT_BINARY_DIR}/lib)
include_directories(${PROJECT_SOURCE_DIR}/include)
add_library (${PROJECT_NAME} STATIC ${SOURCES})
add_subdirectory(example)
add_subdirectory(tests)
find_library(FOO_LIB libcurl.a)
target_link_libraries(TechProject "${FOO_LIB}")
And CMakeLists.txt in tests subdir:
cmake_minimum_required(VERSION 2.8)
set(TESTS_FOR_PROJECT TechProject)
project(${TESTS_FOR_PROJECT}_tests)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
option(BUILD_SHARED_LIBS "Build shared instead of static library" OFF)
file(GLOB ${PROJECT_NAME}_sources "${CMAKE_CURRENT_SOURCE_DIR}/source/*.cpp")
find_package(${TESTS_FOR_PROJECT})
include_directories(${${TESTS_FOR_PROJECT}_INCLUDE_DIRS}})
include_directories(${CPM_INCLUDE_DIRS})
add_executable(${PROJECT_NAME} ${${PROJECT_NAME}_sources} ${${PROJECT_NAME}_headers})
target_link_libraries(${PROJECT_NAME} ${TESTS_FOR_PROJECT})
add_custom_command(TARGET ${PROJECT_NAME} PRE_BUILD
COMMAND ${CMAKE_COMMAND} -E copy_directory
${CMAKE_CURRENT_SOURCE_DIR}/fixtures $<TARGET_FILE_DIR:${PROJECT_NAME}>)
add_custom_command(TARGET ${PROJECT_NAME} POST_BUILD COMMAND ${PROJECT_NAME} -s -r compact WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/bin)