Omnet++ 在omnet++；

在omnet++5.6.1中构建Lte时，我有以下错误：， 注意（Inet内置且工作正常）

In file included from apps/alert/AlertSender.cc:11:
./apps/alert/AlertSender.h:15:10: fatal error: 'inet/transportlayer/contract/udp/UDPSocket.h' file not found
#include "inet/transportlayer/contract/udp/UDPSocket.h"
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from apps/alert/AlertReceiver.cc:10:
./apps/alert/AlertReceiver.h:17:10: fatal error: 'inet/transportlayer/contract/udp/UDPSocket.h' file not found
#include "inet/transportlayer/contract/udp/UDPSocket.h"
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
1 error generated.
 Makefile:288: recipe for target '../out/clang-debug/src/apps/alert/AlertReceiver.o' failed
Makefile:288: recipe for target '../out/clang-debug/src/apps/alert/AlertSender.o' failed
make[1]: Leaving directory '/home/pradeepkumar/simulte-1.1.0/src'
make[1]: *** [../out/clang-debug/src/apps/alert/AlertReceiver.o] Error 1
make[1]: *** Waiting for unfinished jobs....
Makefile:2: recipe for target 'all' failed
make[1]: *** [../out/clang-debug/src/apps/alert/AlertSender.o] Error 1
make: *** [all] Error 2
"make MODE=debug -j2 all" terminated with exit code 2. Build might be incomplete.