fix snapcraft build

CMakeLists.txt

@@ -73,20 +73,20 @@ add_library(v4l2wrapper STATIC ${LIBSRC_FILES})
 target_link_libraries (${PROJECT_NAME} v4l2wrapper) 
 
 # live555
-if (NOT EXISTS live)
-    file (DOWNLOAD ${LIVE555URL} ${CMAKE_SOURCE_DIR}/live555-latest.tar.gz )
-    EXECUTE_PROCESS(COMMAND ${CMAKE_COMMAND} -E tar xf live555-latest.tar.gz  RESULT_VARIABLE unpack_result)
+set(LIVE ${CMAKE_BINARY_DIR}/live)
+if (NOT EXISTS ${LIVE})
+    file (DOWNLOAD ${LIVE555URL} ${CMAKE_BINARY_DIR}/live555-latest.tar.gz )
+    EXECUTE_PROCESS(COMMAND ${CMAKE_COMMAND} -E tar xvf ${CMAKE_BINARY_DIR}/live555-latest.tar.gz  RESULT_VARIABLE unpack_result)
     if(NOT unpack_result STREQUAL "0")
         message(FATAL_ERROR "Fetching and compiling live555 failed!")
     endif()
-endif(NOT EXISTS live) 
-FILE(GLOB LIVESOURCE live/groupsock/*.c* live/liveMedia/*.c* live/UsageEnvironment/*.c* live/BasicUsageEnvironment/*.c*)
+endif()
+FILE(GLOB LIVESOURCE ${LIVE}/groupsock/*.c* ${LIVE}/liveMedia/*.c* ${LIVE}/UsageEnvironment/*.c* ${LIVE}/BasicUsageEnvironment/*.c*)
 add_definitions(${LIVE555CFLAGS})
 add_library (live555 STATIC ${LIVESOURCE})
-target_include_directories(live555 PUBLIC live/groupsock/include live/liveMedia/include live/UsageEnvironment/include live/BasicUsageEnvironment/include)
+target_include_directories(live555 PUBLIC ${LIVE}/groupsock/include ${LIVE}/liveMedia/include ${LIVE}/UsageEnvironment/include ${LIVE}/BasicUsageEnvironment/include)
 target_link_libraries (${PROJECT_NAME} live555)
 
-
 #testing
 enable_testing()
 add_test(help ./${PROJECT_NAME} -h)

snap/snapcraft.yaml

@@ -1,6 +1,6 @@
 
   name: v4l2-rtspserver
-  version: '0.1' # just for humans, typically '1.2+git' or '1.3.2'
+  version: git
   summary: RTSP Server for V4L2 device capture supporting HEVC/H264/JPEG/VP8/VP9
   description: |
     This is my-snap's description. You have a paragraph or two to tell the
@@ -12,7 +12,7 @@
   confinement: devmode # use 'strict' once you have the right plugs and slots
 
   parts:
-    build:
+    v4l2rtspserver:
       plugin: cmake
       source: .
       source-type: git
@@ -22,7 +22,5 @@
       - pkg-config
       - liblog4cpp5-dev
       - libasound2-dev
-      configflags:
-      - -DCMAKE_INSTALL_PREFIX=/