$ emerge -pqv '=net-voip/yate-5.5.0-r1::net-kit'
[ebuild  N    ] net-voip/yate-5.5.0-r1  USE="gsm h323 ilbc ilbc-webrtc isac-float mysql speex ssl zlib -amrnb -dahdi -doc -isac-fixed -postgres -qt4 -sctp -spandsp -tdmcard -wanpipe -wpcard -zaptel" CPU_FLAGS_X86="sse2"

h323chan.cpp: In member function ‘virtual void \{anonymous}::H323Driver::initialize()’:
h323chan.cpp:3394:5: error: ‘PTrace’ has not been declared
     PTrace::Initialise(dbg,0,PTrace::Blocks | PTrace::Timestamp
     ^
h323chan.cpp:3394:30: error: ‘PTrace’ has not been declared
     PTrace::Initialise(dbg,0,PTrace::Blocks | PTrace::Timestamp
                              ^
h323chan.cpp:3394:47: error: ‘PTrace’ has not been declared
     PTrace::Initialise(dbg,0,PTrace::Blocks | PTrace::Timestamp
                                               ^
h323chan.cpp:3395:4: error: ‘PTrace’ has not been declared
  | PTrace::Thread | PTrace::FileAndLine);
    ^
h323chan.cpp:3395:21: error: ‘PTrace’ has not been declared
  | PTrace::Thread | PTrace::FileAndLine);
                     ^
Makefile:306: recipe for target 'h323chan.yate' failed