学习Qt第三章遇到问题

到Qt教材的第二章我都成功编译好了开发环境，到第三章我按照教材，成功生成了所有所需要的文件，按照教材，把Makefile文件里面按照教材修改好了，也把重复的地方删除了。其他文件也都按教材修改好了。
   然后我在输入命令make后，系统编译了一会，最后显示ld returned 1 exit status。编译信息如下：
   [root@localhost First]# make
g++ -c -pipe -DQWS -fno-exceptions -fno-rtti -Wall -W -O2 -DNO_DEBUG -I/opt/EmbedSky/Qte/x86-qtopia-2.2.0/qt2/include -I/opt/EmbedSky/Qte/x86-qtopia-2.2.0/qtopia/include -o first.o first.cpp
/opt/EmbedSky/Qte/x86-qtopia-2.2.0/qt2/include/qtooltip.h:87: warning: ‘class QToolTip’ has virtual functions but non-virtual destructor
g++ -c -pipe -DQWS -fno-exceptions -fno-rtti -Wall -W -O2 -DNO_DEBUG -I/opt/EmbedSky/Qte/x86-qtopia-2.2.0/qt2/include -I/opt/EmbedSky/Qte/x86-qtopia-2.2.0/qtopia/include -o main.o main.cpp
/opt/EmbedSky/Qte/x86-qtopia-2.2.0/qt2/include/qdatetime.h:51: warning: ‘class QDate’ has virtual functions but non-virtual destructor
/opt/EmbedSky/Qte/x86-qtopia-2.2.0/qtopia/include/qtopia/../../src/libraries/qtopia/qcom.h:88: warning: ‘struct QUnknownInterface’ has virtual functions but non-virtual destructor
/opt/EmbedSky/Qte/x86-qtopia-2.2.0/qtopia/include/qtopia/../../src/libraries/qtopia/qcom.h:100: warning: ‘struct QLibraryInterface’ has virtual functions but non-virtual destructor
/opt/EmbedSky/Qte/x86-qtopia-2.2.0/qtopia/include/qtopia/../../src/libraries/qtopia/applicationinterface.h:49: warning: ‘struct ApplicationInterface’ has virtual functions but non-virtual destructor
g++ -c -pipe -DQWS -fno-exceptions -fno-rtti -Wall -W -O2 -DNO_DEBUG -I/opt/EmbedSky/Qte/x86-qtopia-2.2.0/qt2/include -I/opt/EmbedSky/Qte/x86-qtopia-2.2.0/qtopia/include -o moc_first.o moc_first.cpp
g++  -o /opt/EmbedSky/Qte/x86-qtopia-2.2.0/qtopia/image/opt/Qtopia/bin/first first.o main.o first.o moc_first.o  -L/opt/EmbedSky/Qte/x86-qtopia-2.2.0/qtopia/lib -L/opt/EmbedSky/Qte/x86-qtopia-2.2.0/qt2/lib -lqpe -lqtopia -lqte
first.o: In function `first::~first()':
first.cpp:(.text+0x0): multiple definition of `first::~first()'
first.o:first.cpp:(.text+0x0): first defined here
first.o: In function `first::~first()':
first.cpp:(.text+0x30): multiple definition of `first::~first()'
first.o:first.cpp:(.text+0x30): first defined here
first.o: In function `first::~first()':
first.cpp:(.text+0x50): multiple definition of `first::~first()'
first.o:first.cpp:(.text+0x50): first defined here
first.o: In function `first::user_button()':
first.cpp:(.text+0x70): multiple definition of `first::user_button()'
first.o:first.cpp:(.text+0x70): first defined here
first.o: In function `first::first(QWidget*, char const*, unsigned int)':
first.cpp:(.text+0xf0): multiple definition of `first::first(QWidget*, char const*, unsigned int)'
first.o:first.cpp:(.text+0xf0): first defined here
first.o: In function `first::first(QWidget*, char const*, unsigned int)':
first.cpp:(.text+0x420): multiple definition of `first::first(QWidget*, char const*, unsigned int)'
first.o:first.cpp:(.text+0x420): first defined here
collect2: ld returned 1 exit status
make: *** [/opt/EmbedSky/Qte/x86-qtopia-2.2.0/qtopia/image/opt/Qtopia/bin/first] Error 1

Makefile文件中应该还是有重复信息。

2# 亚瑟王
我和教材的Makefile对照过了，是一模一样的呢！

我也遇到和lz一样问题，求亚瑟王解答

估计有没修改的地方

5# super2071
我后来仔细做了Makefile文件，然后编译成功了，不过，对于之前为什么没成功，我还是不知道。十分感谢你精彩的回答，帮我坚定信心，好好编写程序！