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Setting up a MinGW/Qt only environment...
-- QTDIR set to C:\Qt\4.6.2
-- PATH set to C:\Qt\4.6.2\bin
-- Adding C:\MinGW\bin to PATH
-- Adding C:\WINDOWS\System32 to PATH
-- QMAKESPEC set to win32-g++

C:\Qt\4.6.2>cd qwt-5.2.0

C:\Qt\4.6.2\qwt-5.2.0>qmake qwt.pro

C:\Qt\4.6.2\qwt-5.2.0>make
cd src\ && mingw32-make -f Makefile
mingw32-make[1]: Entering directory `C:/Qt/4.6.2/qwt-5.2.0/src'
mingw32-make -f Makefile.Release all
mingw32-make[2]: Entering directory `C:/Qt/4.6.2/qwt-5.2.0/src'
g++ -c -O2 -Wall -frtti -fexceptions -mthreads -DUNICODE -DQT_LARGEFILE_SUPPORT
-DQT_DLL -DQWT_DLL -DQWT_MAKEDLL -DQT_THREAD_SUPPORT -DQT_DLL -DQT_NO_DEBUG -DQT
_GUI_LIB -DQT_CORE_LIB -I"..\..\include\QtCore" -I"..\..\include\QtGui" -I"..\..
\include" -I"..\..\include\ActiveQt" -I"moc" -I"c:\Qt\2010.02.1\qt\mkspecs\win32
-g++" -o obj\qwt_plot.o qwt_plot.cpp
../../include/QtCore/../../src/corelib/tools/qhash.h: In member function `typena
me QHash<K, V>::Node** QHash<K, V>::findNode(const Key&, uint*) const [with Key
= qreal, T = QHashDummyValue]':
../../include/QtCore/../../src/corelib/tools/qhash.h:752:   instantiated from `t
ypename QHash<K, V>::iterator QHash<K, V>::insert(const Key&, const T&) [with Ke
y = qreal, T = QHashDummyValue]'
../../include/QtCore/../../src/corelib/tools/qset.h:175:   instantiated from `QS
et<V>::const_iterator QSet<V>::insert(const T&) [with T = qreal]'
../../include/QtCore/../../src/corelib/tools/qset.h:309:   instantiated from `QS
et<T> QList<T>::toSet() const [with T = qreal]'
qwt_valuelist.h:48:   instantiated from here
../../include/QtCore/../../src/corelib/tools/qhash.h:875: error: call of overloa
ded `qHash(const double&)' is ambiguous
../../include/QtCore/../../src/corelib/tools/qhash.h:62: note: candidates are: u
int qHash(char)
../../include/QtCore/../../src/corelib/tools/qhash.h:63: note:                 u
int qHash(uchar)
../../include/QtCore/../../src/corelib/tools/qhash.h:64: note:                 u
int qHash(signed char)
../../include/QtCore/../../src/corelib/tools/qhash.h:65: note:                 u
int qHash(ushort)
../../include/QtCore/../../src/corelib/tools/qhash.h:66: note:                 u
int qHash(short int)
../../include/QtCore/../../src/corelib/tools/qhash.h:67: note:                 u
int qHash(uint)
../../include/QtCore/../../src/corelib/tools/qhash.h:68: note:                 u
int qHash(int)
../../include/QtCore/../../src/corelib/tools/qhash.h:70: note:                 u
int qHash(ulong)
../../include/QtCore/../../src/corelib/tools/qhash.h:77: note:                 u
int qHash(long int)
../../include/QtCore/../../src/corelib/tools/qhash.h:79: note:                 u
int qHash(quint64)
../../include/QtCore/../../src/corelib/tools/qhash.h:86: note:                 u
int qHash(qint64)
../../include/QtCore/../../src/corelib/tools/qhash.h:87: note:                 u
int qHash(QChar)
mingw32-make[2]: *** [obj/qwt_plot.o] Error 1
mingw32-make[2]: Leaving directory `C:/Qt/4.6.2/qwt-5.2.0/src'
mingw32-make[1]: *** [release-all] Error 2
mingw32-make[1]: Leaving directory `C:/Qt/4.6.2/qwt-5.2.0/src'
mingw32-make: *** [sub-src-make_default] Error 2