64bit 系统运行32bit软件兼容性问题，错误提示:libstdc++.so.6 not found,libstdc++.so.6.0.17 32和64位，可以使用，按要求放在相应的文件夹下就行了
/usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.15' not found (required by /opt/qtcreator-3.3.0/lib/qtcreator/plugins/.././libQt5CLucene.so.5) 压缩包中是linux的32和64位的库，可以使用file命令查看 将相应的库覆盖/usr/lib/libstdc++.so.6.0.13或其他版本的库，再运行qtcreator即可。
说明：
./INSTALL时，发现libstdc++.so.6 找不到。可是locate libstdc++.so.6 ,发现明明有的：
$ locate libstdc++.so.6
/usr/lib/libstdc++.so.6
/usr/lib/libstdc++.so.6.0.13
于是。。。 先把 instcore 拿出来测试。
vowstar@vowstar-desktop:~/Downloads/Test$ ldd instcore
Linux-gate.so.1 => (0xf777a000)
libQtXml.so.4 => not found
libQtGui.so.4 => not found
libQtCore.so.4 => not found
libpthread.so.0 => /lib32/libpthread.so.0 (0xf774c000)
libstdc++.so.6 => not found
libm.so.6 => /lib32/libm.so.6 (0xf7726000)
libgcc_s.so.1 => not found
libc.so.6 => /lib32/libc.so.6 (0xf75cc000)
/lib/ld-linux.so.2 (0xf777b000)
原来全链接到32位库去了, 于是想办法兼容32位：
$ sudo apt-get install ia32-libs ia32-libs-gtk linux32 lib32asound2
vowstar@vowstar-desktop:~/Downloads/Test$ ldd instcore
linux-gate.so.1 => (0xf77d8000)
libQtXml.so.4 => /usr/lib32/libQtXml.so.4 (0xf7775000)
libQtGui.so.4 => /usr/lib32/libQtGui.so.4 (0xf6cf9000)
libQtCore.so.4 => /usr/lib32/libQtCore.so.4 (0xf6a7a000)
libpthread.so.0 => /lib32/libpthread.so.0 (0xf6a61000)
libstdc++.so.6 => /usr/lib32/libstdc++.so.6 (0xf696c000)
libm.so.6 => /lib32/libm.so.6 (0xf6946000)
libgcc_s.so.1 => /usr/lib32/libgcc_s.so.1 (0xf6927000)
libc.so.6 => /lib32/libc.so.6 (0xf67cd000)
libfontconfig.so.1 => /usr/lib32/libfontconfig.so.1 (0xf679d000)
libaudio.so.2 => /usr/lib32/libaudio.so.2 (0xf6786000)
libglib-2.0.so.0 => /lib32/libglib-2.0.so.0 (0xf66bc000)
libpng12.so.0 => /lib32/libpng12.so.0 (0xf6697000)
libz.so.1 => /usr/lib32/libz.so.1 (0xf6681000)
libfreetype.so.6 => /usr/lib32/libfreetype.so.6 (0xf660b000)
libgobject-2.0.so.0 => /usr/lib32/libgobject-2.0.so.0 (0xf65cc000)
libSM.so.6 => /usr/lib32/libSM.so.6 (0xf65c3000)
libICE.so.6 => /usr/lib32/libICE.so.6 (0xf65aa000)
libXrender.so.1 => /usr/lib32/libXrender.so.1 (0xf659f000)
libXext.so.6 => /usr/lib32/libXext.so.6 (0xf658f000)
libX11.so.6 => /usr/lib32/libX11.so.6 (0xf6472000)
libdl.so.2 => /lib32/libdl.so.2 (0xf646e000)
libgthread-2.0.so.0 => /usr/lib32/libgthread-2.0.so.0 (0xf6468000)
librt.so.1 => /lib32/librt.so.1 (0xf645f000)
/lib/ld-linux.so.2 (0xf77d9000)
libexpat.so.1 => /lib32/libexpat.so.1 (0xf6437000)
libXt.so.6 => /usr/lib32/libXt.so.6 (0xf63e4000)
libXau.so.6 => /usr/lib32/libXau.so.6 (0xf63e0000)
libpcre.so.3 => /lib32/libpcre.so.3 (0xf63af000)
libuuid.so.1 => /lib32/libuuid.so.1 (0xf63aa000)
libxcb.so.1 => /usr/lib32/libxcb.so.1 (0xf638f000)
libXdmcp.so.6 => /usr/lib32/libXdmcp.so.6 (0xf6389000)
问题解决。
