原因是新建了一個可執行的函數，里面卻沒有main函數，加上main函數即可
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/usr/lib/x86_64-linux-gnu/libopencv_highgui.so：對‘TIFFReadRGBAStrip@LIBTIFF_4.0’未定義的引用
/usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/crt1.o: In function `_start': (.text+0x18): undefined reference to `main' collect2: ld returne
gcc 錯誤 //usr/lib/x86_64-linux-gnu/libstdc++.so.6 ...
解決 /usr/lib/x86_64-linux-gnu/liblapack.so.3: undefined reference to `gotoblas'
/usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.9: undefined reference toTIFFIsTiled@LIBTIFF_4.0'
qmake: could not exec '/usr/lib/x86_64-linux-gnu/qt4/bin/qmake': No such file or directory
qt下qmake:提示could not exec '/usr/lib/x86_64-linux-gnu/qt4/bin/qmake': No such file or directory
/usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.9: undefined reference toTIFFIsTiled@LIBTIFF_4.0'
使用curl出現，curl: /usr/local/lib/libssl.so.1.1: version `OPENSSL_1_1_1' not found (required by /usr/lib/x86_64-linux-gnu/libcurl.so.4)
opencv出現問題：/usr/lib/x86_64-linux-gnu/libpng16.so.16: undefined reference to `inflateValidate@ZLIB_1.2.9'