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我有一个项目，我开始使用 QT5 构建，但由于公司中的其他人使用 QT4，我尝试使其恢复兼容。我能够让所有包含等工作正常，但有一个我无法弄清楚的链接错误。

错误是：

compiling gen/Release/obj/qrc_map_markup_gui.cpp
linking bin/visual_route_generationmap_markup_gui
/usr/bin/ld: warning: libicui18n.so.49, needed by /other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5, not found (try using -rpath or -rpath-link)
/usr/bin/ld: warning: libicuuc.so.49, needed by /other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5, not found (try using -rpath or -rpath-link)
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ucnv_compareNames_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ucol_close_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ucol_setAttribute_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ucnv_toUnicode_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ures_getStringByKey_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `u_strToUpper_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ucnv_countAvailable_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ucol_open_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `u_strToLower_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ucnv_getDefaultName_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ucnv_getStandardName_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ucol_getAttribute_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ucnv_countAliases_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ures_open_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ures_close_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ucnv_close_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ucol_strcoll_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ucnv_setSubstChars_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ucnv_fromUnicode_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ucnv_getAvailableName_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ucnv_getAlias_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ucol_getSortKey_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ucnv_getMaxCharSize_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `ucnv_open_49'
/other/Qt5.0.1/5.0.1/gcc_64/lib/libQt5Core.so.5: undefined reference to `u_errorName_49'
collect2: ld returned 1 exit status
make[1]: *** [bin/visual_route_generationmap_markup_gui] Error 1
make[1]: Leaving directory `/lucid/other/workspace/perception/visual_route_generation/map_markup_gui'
make: *** [release-all] Error 2

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它仍在尝试使用 QT5 库。我已经从 .bashrc 中删除了所有设置的变量。如何使 pro 文件仅查找 qt4 库？

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