允许手动指定protobuf库文件路径

src/CMakeLists.txt

@@ -34,4 +34,9 @@ else ()
 endif ()
 
 target_include_directories(Transmission PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
-target_link_libraries(Transmission protobuf proto lzma)
+if(NOT DEFINED PROTOBUF_LIB_PATH)
+    set(PROTOBUF_LIB_PATH "protobuf")
+else ()
+    message("手动指定protobuf库为${PROTOBUF_LIB_PATH}")
+endif ()
+target_link_libraries(Transmission ${PROTOBUF_LIB_PATH} proto lzma)