Не могу собрать GoldenDict

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$ make
g++ -c -pipe -rdynamic -O2 -march=i486 -mtune=i686 -Wall -W -D_REENTRANT -DPROGRAM_DATA_DIR=\"/usr/local/share/apps/goldendict/\" -DPROGRAM_VERSION=\"1.0.1\" -DQT_NO_DEBUG -DQT_WEBKIT_LIB -DQT_PHONON_LIB -DQT_XML_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/lib/qt/mkspecs/linux-g++ -I. -I/usr/lib/qt/include/QtCore -I/usr/lib/qt/include/QtNetwork -I/usr/lib/qt/include/QtGui -I/usr/lib/qt/include/QtXml -I/usr/lib/qt/include/phonon -I/usr/lib/qt/include/QtWebKit -I/usr/lib/qt/include -I. -Iqtsingleapplication/src -I/usr/include/hunspell -I/usr/lib/qt/include/phonon_compat -Ibuild -Ibuild -o build/processwrapper.o processwrapper.cc
processwrapper.cc: In static member function «static unsigned int ProcessWrapper::currentProcessId()»:
processwrapper.cc:99:19: ошибка: нет декларации «getpid» в этой области видимости
processwrapper.cc:100:1: предупреждение: control reaches end of non-void function [-Wreturn-type]
make: *** [build/processwrapper.o] Ошибка 1
Информация о системе: Slackware-current с небольшими дополнениями.
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$ uname -a
Linux sl32 3.7.1-smp #2 SMP Thu Dec 20 21:35:25 CST 2012 i686 Intel(R) Atom(TM) CPU D425 @ 1.80GHz GenuineIntel GNU/Linux