Installing re2c

To ensure that Greenplum can correctly parse SQL commands, install re2c.

1. Download the re2c source code.

   cd /opt/tool
   wget https://github.com/skvadrik/re2c/archive/refs/tags/2.0.3.zip

2. Decompress the package and install re2c.

   unzip 2.0.3.zip
   cd re2c-2.0.3/
   ./autogen.sh
   ./configure
   make
   make install