Problem with ldconfig during Tesseract installation: "/usr/local/lib is not a known library type"

I was following this instruction on this site to installing tesseract: https://github.com/tesseract-ocr/tesseract/wiki/Compiling git clone https://github.com/tesseract-ocr/tesseract.git cd tesseract ./autogen.sh ./configure make sudo make install sudo ldconfig But there is a problem in the last line and I got this error messages when I tried ldconfig: /sbin/ldconfig.real: /usr/local/lib is not a known library type /sbin/ldconfig.real: /usr/local/lib/pkgconfig is not a known library type What's that error meaning and how can I fix it? This is the content of /etc/ld.so.conf.d/libc.conf : # libc default configuration /usr/local/lib