Make manual lpcnet download more robust.

CMakeLists.txt

@@ -35,16 +35,15 @@ set(LPCNET_ROOT http://rowetel.com/downloads/deep/)
 set(LPCNET_FILE lpcnet_190215.tgz)
 set(LPCNET_URL ${LPCNET_ROOT}${LPCNET_FILE})
 
-add_subdirectory(src)
-
+# Work around not having the FetchContent module.
 if(CMAKE_VERSION VERSION_LESS 3.11.4)
-    if(NOT EXISTS ${LPCNET_FILE})
+    set(lpcnet_SOURCE_DIR ${CMAKE_BINARY_DIR}/src)
+    if(NOT EXISTS ${lpcnet_SOURCE_DIR})
         file(DOWNLOAD ${LPCNET_URL}
             ${CMAKE_BINARY_DIR}/${LPCNET_FILE}
             SHOW_PROGRESS
         )
         execute_process(COMMAND tar -xzf ${CMAKE_BINARY_DIR}/${LPCNET_FILE} -C ${CMAKE_BINARY_DIR}/src)
-        #execute_process(COMMAND sh -c "cp /home/david/LPCNet/src/${LPCNET_FILE} .; tar xzf ${CMAKE_BINARY_DIR}/${LPCNET_FILE} -C ${CMAKE_BINARY_DIR}/src" )
     endif()
 else()
     include(FetchContent)
@@ -57,5 +56,5 @@ else()
     endif()
 endif()
 
-set(lpcnet_SOURCE_DIR ${CMAKE_BINARY_DIR}/src)
+add_subdirectory(src)
 

src/CMakeLists.txt

@@ -14,7 +14,7 @@ set(lpcnet_freedv_srcs
     4stage_direct_split_vq.c
     lpcnet.c
     nnet.c
-    nnet_data.c
+    ${lpcnet_SOURCE_DIR}/nnet_data.c
 )
 
 add_library(lpcnetfreedv STATIC ${lpcnet_freedv_srcs})