>>> Unpacking source...
>>> Unpacking qca-pkcs11-2.0.0-beta2.tar.bz2 to /var/tmp/portage/app-crypt/qca-pkcs11-2.0.0_beta2/work
>>> Source unpacked in /var/tmp/portage/app-crypt/qca-pkcs11-2.0.0_beta2/work
>>> Compiling source in /var/tmp/portage/app-crypt/qca-pkcs11-2.0.0_beta2/work/qca-pkcs11-2.0.0-beta2 ...
Configuring qca-pkcs11 ...
Verifying Qt 4 build environment ... ok
Checking for QCA >= 2.0 ... yes
Checking for pkcs11-helper ... yes

Good, your configure finished.  Now run /usr/bin/gmake.

 * Running qmake on qca-pkcs11.pro ...
  [ ok ]
make -j14 
/usr/bin/moc -DQT_NO_DEBUG -DQT_PLUGIN -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4 -I/usr/include/qca2/QtCrypto -I. qca-pkcs11.cpp -o qca-pkcs11.moc
i686-pc-linux-gnu-g++ -c -pipe -O2 -pipe -Wall -W -D_REENTRANT -fPIC -DQT_NO_DEBUG -DQT_PLUGIN -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4 -I/usr/include/qca2/QtCrypto -I. -o qca-pkcs11.o qca-pkcs11.cpp
qca-pkcs11.cpp: In member function 'void pkcs11Provider::_logHook(unsigned int, const char*, char*)':
qca-pkcs11.cpp:3044: error: '::vsnprintf' has not been declared
make: *** [qca-pkcs11.o] Error 1
 * 
 * ERROR: app-crypt/qca-pkcs11-2.0.0_beta2 failed.
 * Call stack:
 *               ebuild.sh, line   49:  Called src_compile
 *             environment, line 2979:  Called die
 * The specific snippet of code:
 *       emake || die "make failed"
 *  The die message:
 *   make failed
 * 
 * If you need support, post the topmost build error, and the call stack if relevant.
 * A complete build log is located at '/var/log/portage/app-crypt/qca-pkcs11-2.0.0_beta2:20090707-023154.log'.
 * The ebuild environment file is located at '/var/tmp/portage/app-crypt/qca-pkcs11-2.0.0_beta2/temp/environment'.
 *