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Tesseract is installed on the OS using the apt-get command. The command you are using (PIP) is for installing Python packages, that is the reason for the error.
For reference: http://docs.mayan-edms.com/en/stable/topics/deploying.html#deploying
If using a Debian or Ubuntu based Linux distribution, get the executable requirements using:
sudo apt-get install g++ gcc ghostscript gnupg1 graphviz libjpeg-dev libmagic1 \
libpq-dev libpng-dev libreoffice libtiff-dev poppler-utils postgresql \
python-dev python-pip python-virtualenv redis-server sane-utils supervisor \
tesseract-ocr zlib1g-dev -y
Source:stackexchange.com