Fix README files

README.linux.md

@@ -150,15 +150,7 @@
     su - $USER # Apply settings
     ```
 
-5. Install the **correct** version of the Xerces-C++ library. 
-To do this, go to [the next step of the main instructions](README.md#xerces).
-
-6. Update the library cache:
-    ```bash
-    sudo ldconfig
-    ```
-
-7. Make sure that you download yaml and psutil as submodules. To do this, use `git clone --recurse-submodules` when downloading the source code. If you want to update the submodules, run:
+5. Make sure that you download yaml and psutil as submodules. To do this, use `git clone --recurse-submodules` when downloading the source code. If you want to update the submodules, run:
     ```bash
     git submodule update --init --recursive --force
     ```

README.md

@@ -37,13 +37,6 @@ Follow [these macOS steps](README.macOS.md) for getting your system ready for GP
 ### Installing dependencies (for Linux developers)
 Follow [appropriate linux steps](README.linux.md) for getting your system ready for GPDB
 
-## xerces
-
-ORCA requires xerces 3.1 or gp-xerces. For the most up-to-date way of
-building gp-xerces, see the README at the following repository:
-
-* https://github.com/arenadata/gp-xerces
-
 ### Build the database
 
 ```

src/backend/gporca/README.md

@@ -27,16 +27,6 @@ package manager.
 
 # First Time Setup
 
-## Pre-Requisites
-
-GPORCA uses the following library:
-* GP-Xerces - Greenplum's patched version of Xerces-C 3.1.X
-
-### Installing GP-Xerces
-
-[GP-XERCES is available here](https://github.com/greenplum-db/gp-xerces). The GP-XERCES README
-gives instructions for building and installing.
-
 ## Build and install GPORCA
 
 ORCA is built automatically with GPDB as long as `--disable-orca` is not used.