Cmake Library error while compiling？

[cc114230]

[ 77%] Built target opcuaserver
[ 78%] Linking CXX executable bin/example_server
/usr/bin/ld: cannot find -lmbedcrypto
/usr/bin/ld: cannot find -lmbedx509
/usr/bin/ld: cannot find -lmbedtls
collect2: error: ld returned 1 exit status
CMakeFiles/example_server.dir/build.make:105: recipe for target 'bin/example_server' failed
make[2]: *** [bin/example_server] Error 1
CMakeFiles/Makefile2:69: recipe for target 'CMakeFiles/example_server.dir/all' failed
make[1]: *** [CMakeFiles/example_server.dir/all] Error 2
Makefile:151: recipe for target 'all' failed
make: *** [all] Error 2

i am using Ubuntu 18.0.4，how can i solve it? Thank you.

[guojing555]

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