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Error：R安装包时，报错：ld: library not found for -lgfortran，抱怨找不到gfortran，具体如下：ld: warning: directory not found for option '-L/usr/local/gfortran/lib/gcc/x86_64-apple-darwin15/6.1.0'ld: warning: directory not found for option '-L/usr/local/gfortran/lib'ld: lib