Не собирается KVirc

При сборке KVirc-3.2.5 в Gentoo 2006.1 компилятор выдаёт следующее:

idle_x11.cpp:38:37: error: X11/extensions/scrnsaver.h: No such file or directory
idle_x11.cpp:54: error: ISO C++ forbids declaration of 'XScreenSaverInfo' with no type
idle_x11.cpp:54: error: expected ';' before '*' token
idle_x11.cpp: In constructor 'IdlePlatform::IdlePlatform()':
idle_x11.cpp:60: error: 'class IdlePlatform::Private' has no member named 'ss_info'
idle_x11.cpp: In destructor 'IdlePlatform::~IdlePlatform()':
idle_x11.cpp:65: error: 'class IdlePlatform::Private' has no member named 'ss_info'
idle_x11.cpp:66: error: 'class IdlePlatform::Private' has no member named 'ss_info'
idle_x11.cpp: In member function 'bool IdlePlatform::init()':
idle_x11.cpp:76: error: 'class IdlePlatform::Private' has no member named 'ss_info'
idle_x11.cpp:82: error: 'XScreenSaverQueryExtension' was not declared in this scope
idle_x11.cpp:83: error: 'class IdlePlatform::Private' has no member named 'ss_info'
idle_x11.cpp:83: error: 'XScreenSaverAllocInfo' was not declared in this scope
idle_x11.cpp: In member function 'int IdlePlatform::secondsIdle()':
idle_x11.cpp:91: error: 'class IdlePlatform::Private' has no member named 'ss_info'
idle_x11.cpp:93: error: 'class IdlePlatform::Private' has no member named 'ss_info'
idle_x11.cpp:93: error: 'XScreenSaverQueryInfo' was not declared in this scope
idle_x11.cpp:95: error: 'class IdlePlatform::Private' has no member named 'ss_info'

В чём может быть дело ?