fix for other platforms

src/sound/CMakeLists.txt

@@ -178,6 +178,9 @@ pkg_check_modules(SERIALPORT REQUIRED libserialport)
 if(APPLE)
     include_directories(${LIBSERIALPORT_ROOT}/include)
     target_link_libraries(86Box ${LIBSERIALPORT_ROOT}/lib/libserialport.dylib)
+else()
+    include_directories(${SERIALPORT_INCLUDE_DIRS})
+    target_link_libraries(86Box ${SERIALPORT_LIBRARIES})
 endif()
   
 add_subdirectory(resid-fp)