Bearer plugin does not compile in Linux

qgenericengine.cpp needs to include <unistd.h>

------------------------------------------
make[3]: Entering directory `/home/vlad/src/qt/src/plugins/bearer/generic'
/canmore/sdk/bin/i686-cm-linux-g++ -c -DCANMORE -I/canmore/sdk/include -I/canmore/sdk/include/linux_user -I/canmore/sdk/usr/include -fno-exceptions -g -D_REENTRANT -Wall -W -fPIC -DQT_PLUGIN -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_SHARED -I../../../../mkspecs/qws/linux-cm-g++ -I. -I../../../../include/QtCore -I../../../../include/QtNetwork -I../../../../include/QtGui -I../../../../include -I.moc/debug-shared-emb-auto -I/home/vlad/src/mpower/canmore/sdk/include -o .obj/debug-shared-emb-auto/qgenericengine.o qgenericengine.cpp
../../../../include/QtNetwork/private/../../../src/network/bearer/qnetworkconfiguration_p.h:64: warning: 'class QNetworkConfigurationPrivate' has virtual functions but non-virtual destructor
qgenericengine.cpp: In function 'QString qGetInterfaceType(const QString&)':
qgenericengine.cpp:135: error: 'close' was not declared in this scope
make[3]: *** [.obj/debug-shared-emb-auto/qgenericengine.o] Error 1