使用qmake生成Makefile时提示找不到-lQtCore的问题求助

我是qmake新手，尝试为包含hello.c、hello.h、main.c的简单项目用qmake生成Makefile，编写的.pro文件内容如下：

SOURCES += hello.c
SOURCES += main.c
CONFIG += console
HEADERS += hello.h

TARGET = helloworld


QT -= gui

执行make时出现错误：

Can't find -lQtCore

执行ld -lQtCore --verbose，得到如下结果：

attempt to open //usr/x86_64-redhat-linux/lib64/libQtCore.so failed
attempt to open //usr/x86_64-redhat-linux/lib64/libQtCore.a failed
attempt to open //usr/lib64/libQtCore.so succeeded
-lQtCore (//usr/lib64/libQtCore.so)
libpthread.so.0 needed by //usr/lib64/libQtCore.so
found libpthread.so.0 at //usr/lib64/libpthread.so.0
libz.so.1 needed by //usr/lib64/libQtCore.so
found libz.so.1 at //usr/lib64/libz.so.1
libdl.so.2 needed by //usr/lib64/libQtCore.so
found libdl.so.2 at //usr/lib64/libdl.so.2
libgthread-2.0.so.0 needed by //usr/lib64/libQtCore.so
found libgthread-2.0.so.0 at //usr/lib64/libgthread-2.0.so.0
libglib-2.0.so.0 needed by //usr/lib64/libQtCore.so
found libglib-2.0.so.0 at //usr/lib64/libglib-2.0.so.0
librt.so.1 needed by //usr/lib64/libQtCore.so
found librt.so.1 at //usr/lib64/librt.so.1
libstdc++.so.6 needed by //usr/lib64/libQtCore.so
found libstdc++.so.6 at //usr/lib64/libstdc++.so.6
libm.so.6 needed by //usr/lib64/libQtCore.so
found libm.so.6 at //usr/lib64/libm.so.6
libgcc_s.so.1 needed by //usr/lib64/libQtCore.so
found libgcc_s.so.1 at //usr/lib64/libgcc_s.so.1
libc.so.6 needed by //usr/lib64/libQtCore.so
found libc.so.6 at //usr/lib64/libc.so.6
ld-linux-x86-64.so.2 needed by //usr/lib64/libQtCore.so
found ld-linux-x86-64.so.2 at //usr/lib64/ld-linux-x86-64.so.2
libpcre.so.1 needed by //usr/lib64/libgthread-2.0.so.0
found libpcre.so.1 at //usr/lib64/libpcre.so.1
ld: warning: cannot find entry symbol _start; not setting start address

已在.pro文件中添加INCLUDEPATH += /usr/lib64，但问题仍未解决，请问这是什么原因？

1. 修正路径配置错误
   你添加的INCLUDEPATH += /usr/lib64是用来指定头文件搜索路径的，而链接器找不到库文件需要配置的是库文件搜索路径。把这行替换为：

QMAKE_LIBDIR += /usr/lib64

QMAKE_LIBDIR是qmake专门用来指定额外库搜索目录的变量，会让生成的Makefile告诉链接器去这个目录找库。

2. 检查Qt版本匹配问题
   从ld的输出看，系统里确实存在libQtCore.so，但要注意：

• 如果你的系统装的是Qt5，库文件名实际是libQt5Core.so，这种情况下需要确保qmake是Qt5版本的（比如用qmake-qt5命令），或者在.pro文件里明确指定链接：

  LIBS += -lQt5Core
  

• 如果用的是Qt4，libQtCore.so是正确的，但要确认qmake指向的是Qt4的版本。

3. 重新生成Makefile并编译
   修改完.pro文件后，删除原来的Makefile，重新执行qmake生成新的配置文件，再运行make即可。

内容的提问来源于stack exchange，提问作者panpan wang