我尝试使用make进行构建，然后得到：
[ 50%] Building C object CMakeFiles/lws-minimal-http-server.dir/minimal-http-server.c.o
In file included from /Data/github/libwebsockets/minimal-examples/http-server/minimal-http-server/minimal-http-server.c:16:
/usr/local/include/libwebsockets.h:223:10: fatal error: 'openssl/ssl.h' file not found
#include <openssl/ssl.h>
^~~~~~~~~~~~~~~
1 error generated.
make[2]: *** [CMakeFiles/lws-minimal-http-server.dir/minimal-http-server.c.o] Error 1
make[1]: *** [CMakeFiles/lws-minimal-http-server.dir/all] Error 2
make: *** [all] Error 2
运行cpp -v时，我得到以下信息：
Apple LLVM version 9.0.0 (clang-900.0.39.2)
Target: x86_64-apple-darwin16.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
"/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang" -cc1 -triple x86_64-apple-macosx10.12.0 -Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage -E -disable-free -disable-llvm-verifier -discard-value-names -main-file-name - -mrelocation-model pic -pic-level 2 -mthread-model posix -mdisable-fp-elim -fno-strict-return -masm-verbose -munwind-tables -target-cpu penryn -target-linker-version 305 -v -dwarf-column-info -debugger-tuning=lldb -resource-dir /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/9.0.0 -I /usr/include -fdebug-compilation-dir /Data/github/libwebsockets/minimal-examples/http-server/minimal-http-server -ferror-limit 19 -fmessage-length 204 -stack-protector 1 -fblocks -fobjc-runtime=macosx-10.12.0 -fencode-extended-block-signature -fmax-type-align=16 -fdiagnostics-show-option -fcolor-diagnostics -traditional-cpp -o - -x c -
clang -cc1 version 9.0.0 (clang-900.0.39.2) default target x86_64-apple-darwin16.7.0
ignoring duplicate directory "/usr/include"
as it is a non-system directory that duplicates a system directory
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/9.0.0/include
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include
/usr/include
/System/Library/Frameworks (framework directory)
/Library/Frameworks (framework directory)
End of search list.
在我的.bash_profile中，我有：
export OPENSSL_ROOT_DIR=/usr/local/opt/openssl/include
export LDFLAGS="-L/usr/local/opt/openssl/lib"
export CPPFLAGS="-I/usr/local/opt/openssl/include"
export PATH="/usr/local/opt/openssl/bin:$PATH"