Github user calebj commented on the issue: https://github.com/apache/nifi-minifi-cpp/pull/206 This causes some tests to fail to link on Linux both on Travis CI and cloud9, both of which are Ubuntu Trusty. Here's the output: ``` [ 19%] Linking CXX executable TestExecuteProcess libminifi/libminifi.a(ListenHTTP.cpp.o): In function `org::apache::nifi::minifi::processors::ListenHTTP::WriteCallback::process(std::shared_ptr<org::apache::nifi::minifi::io::BaseStream>)': ListenHTTP.cpp:(.text+0x9e): undefined reference to `mg_read' ListenHTTP.cpp:(.text+0x10e): undefined reference to `mg_read' libminifi/libminifi.a(ListenHTTP.cpp.o): In function `org::apache::nifi::minifi::processors::ListenHTTP::Handler::handlePost(CivetServer*, mg_connection*)': ListenHTTP.cpp:(.text+0xd80): undefined reference to `mg_get_request_info' ListenHTTP.cpp:(.text+0xe50): undefined reference to `mg_printf' ListenHTTP.cpp:(.text+0x133d): undefined reference to `mg_printf' ListenHTTP.cpp:(.text+0x14c8): undefined reference to `mg_printf' ListenHTTP.cpp:(.text+0x1508): undefined reference to `mg_printf' ListenHTTP.cpp:(.text+0x15a4): undefined reference to `mg_printf' libminifi/libminifi.a(ListenHTTP.cpp.o):ListenHTTP.cpp:(.text+0x16a6): more undefined references to `mg_printf' follow libminifi/libminifi.a(ListenHTTP.cpp.o): In function `org::apache::nifi::minifi::processors::ListenHTTP::onSchedule(org::apache::nifi::minifi::core::ProcessContext*, org::apache::nifi::minifi::core::ProcessSessionFactory*)': ListenHTTP.cpp:(.text+0x254a): undefined reference to `CivetServer::CivetServer(std::vector<std::string, std::allocator<std::string> >, CivetCallbacks const*)' ListenHTTP.cpp:(.text+0x25cb): undefined reference to `CivetServer::addHandler(std::string const&, CivetHandler*)' libminifi/libminifi.a(ListenHTTP.cpp.o): In function `org::apache::nifi::minifi::processors::ListenHTTP::Handler::sendErrorResponse(mg_connection*)': ListenHTTP.cpp:(.text+0x76b): undefined reference to `mg_printf' libminifi/libminifi.a(ListenHTTP.cpp.o):(.rodata._ZTIN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE[_ZTIN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE]+0x10): undefined reference to `typeinfo for CivetHandler' libminifi/libminifi.a(ListenHTTP.cpp.o):(.rodata._ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE[_ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE]+0x20): undefined reference to `CivetHandler::handleGet(CivetServer*, mg_connection*)' libminifi/libminifi.a(ListenHTTP.cpp.o):(.rodata._ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE[_ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE]+0x30): undefined reference to `CivetHandler::handleHead(CivetServer*, mg_connection*)' libminifi/libminifi.a(ListenHTTP.cpp.o):(.rodata._ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE[_ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE]+0x38): undefined reference to `CivetHandler::handlePut(CivetServer*, mg_connection*)' libminifi/libminifi.a(ListenHTTP.cpp.o):(.rodata._ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE[_ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE]+0x40): undefined reference to `CivetHandler::handleDelete(CivetServer*, mg_connection*)' libminifi/libminifi.a(ListenHTTP.cpp.o):(.rodata._ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE[_ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE]+0x48): undefined reference to `CivetHandler::handleOptions(CivetServer*, mg_connection*)' libminifi/libminifi.a(ListenHTTP.cpp.o):(.rodata._ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE[_ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE]+0x50): undefined reference to `CivetHandler::handlePatch(CivetServer*, mg_connection*)' collect2: error: ld returned 1 exit status make[2]: *** [TestExecuteProcess] Error 1 make[1]: *** [CMakeFiles/TestExecuteProcess.dir/all] Error 2 make: *** [all] Error 2 ```
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