最近遇到一个问题，发现centos只能支持到tesseract 3.X版本，版本针对中文识别效果比不上tesseract 4.X以上的版本，所以计划对线上的tesseract进行一次升级

第一步先安装C++17,
下载 gcc-8.3.0.tar.gz

tar -zxvf gcc-8.0.0.tar.gz
cd gcc-8.3.0
./configurechecking for the correct version of gmp.h... no
configure: error: Building GCC requires GMP 4.2+, MPFR 2.4.0+ and MPC 0.8.0+.
Try the --with-gmp, --with-mpfr and/or --with-mpc options to specify
their locations.  Source code for these libraries can be found at
their respective hosting sites as well as at
ftp://gcc.gnu.org/pub/gcc/infrastructure/.  See also
http://gcc.gnu.org/install/prerequisites.html for additional info.  If
you obtained GMP, MPFR and/or MPC from a vendor distribution package,
make sure that you have installed both the libraries and the header
files.  They may be located in separate packages.

发现错误编译不通过
安装依赖库

yum install gcc gcc-c++ gcc-gnat zlib-devel glibc-devel glibc-devel.i686 libgcc libgcc.i686 -y./configuremake && make install &由于安装过程较长，在后台安装
安装成功