fix: support macOS compile

Signed-off-by: weedge <weege007@gmail.com>

src/CMakeLists.txt

@@ -6,5 +6,14 @@ FILE(GLOB_RECURSE SRCS
 )
 add_library(${TARGET} SHARED ${SRCS} ${USRC})
 
+# OS X 11.x doesn't have /usr/lib/libSystem.dylib and needs an explicit setting.
+if ( APPLE AND NOT EXISTS /usr/lib/libSystem.dylib)
+    message(STATUS "apple...")
+    set(CMAKE_C_COMPILER /usr/bin/clang)
+    target_link_libraries(${TARGET} -L/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib)
+    target_link_libraries(${TARGET} -lsystem)
+endif()
+
+
 set_target_properties(${TARGET} PROPERTIES SUFFIX ".so")
 set_target_properties(${TARGET} PROPERTIES PREFIX "")