參考 boringssl 根目錄下的BUILDING.md 安裝相關編譯依賴項
## Build Prerequisites
* [CMake](https://cmake.org/download/) 2.8.11 or later is required.
* Perl 5.6.1 or later is required. On Windows,
[Active State Perl](http://www.activestate.com/activeperl/) has been
reported to work, as has MSYS Perl.
[Strawberry Perl](http://strawberryperl.com/) also works but it adds GCC
to `PATH`, which can confuse some build tools when identifying the compiler
(removing `C:\Strawberry\c\bin` from `PATH` should resolve any problems).
If Perl is not found by CMake, it may be configured explicitly by setting
`PERL_EXECUTABLE`.
* On Windows you currently must use [Ninja](https://ninja-build.org/)
to build; on other platforms, it is not required, but recommended, because
it makes builds faster.
* If you need to build Ninja from source, then a recent version of
[Python](https://www.python.org/downloads/) is required (Python 2.7.5 works).
* On Windows only, [Yasm](http://yasm.tortall.net/) is required. If not found
by CMake, it may be configured explicitly by setting
`CMAKE_ASM_NASM_COMPILER`.
* A C compiler is required. On Windows, MSVC 14 (Visual Studio 2015) or later
with Platform SDK 8.1 or later are supported. Recent versions of GCC (4.8+)
and Clang should work on non-Windows platforms, and maybe on Windows too.
To build the tests, you also need a C++ compiler with C++11 support.
* [Go](https://golang.org/dl/) is required. If not found by CMake, the go
executable may be configured explicitly by setting `GO_EXECUTABLE`.
* To build the x86 and x86\_64 assembly, your assembler must support AVX2
instructions and MOVBE. If using GNU binutils, you must have 2.22 or later.
修改boringssl 根目錄下的CMakeLists.txt：
對所有的 CMAKE_C_FLAGS 和 CMAKE_CXX_FLAGS 像如下添加 -g3， 生成有調試信息的庫文件：
set(CMAKE_C_FLAGS "-g3 -Wall -WX ${MSVC_DISABLED_WARNINGS_STR} ${MSVC_LEVEL4_WARNINGS_STR}")
set(CMAKE_CXX_FLAGS "-g3 -Wall -WX ${MSVC_DISABLED_WARNINGS_STR} ${MSVC_LEVEL4_WARNINGS_STR}")
## Building
Using Make (does not work on Windows):
mkdir build
cd build
cmake ..
make
在build目錄下分別生成如下庫文件：
build/crypto/libcrypto.a
build/ssl/libssl.a
在build 目錄下執行如下命令, 將庫文件安裝到系統：
$sudo cp ./crypto/libcrypto.a /usr/local/lib/
$sudo cp ./ssl/libssl.a /usr/local/lib/
在boringssl 根目錄下執行如下命令，將頭文件安裝到系統：
$sudo cp include/openssl/* /usr/local/include/openssl/
從新編譯應用程序