Building Error. /bin/sh: line 0: cd: ../json-cwx: No such file or directory

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Hi, I followed the steps in the file 'INSTALL' to try building the proxy app.
But I got the following error. It seems there is no 'json-cwx' directory anywhere in the repository.
```
zinechant@MiBookChant:~/ECP/MACSio/MACSio/macsio$ make all
cd ../json-cwx; \
mkdir build install; \
cd json-cwx; \
./autogen.sh; \
cd ..; \
cd build; \
../json-cwx/configure CC="mpicc" --prefix=`pwd`/../install
/bin/sh: line 0: cd: ../json-cwx: No such file or directory
mkdir: cannot create directory ‘build’: File exists
mkdir: cannot create directory ‘install’: File exists
/bin/sh: line 2: cd: json-cwx: No such file or directory
/bin/sh: line 3: ./autogen.sh: No such file or directory
/bin/sh: line 5: cd: build: No such file or directory
/bin/sh: line 6: ../json-cwx/configure: No such file or directory
Makefile:128: recipe for target '../json-cwx/build' failed
make: *** [../json-cwx/build] Error 127
```
Thanks in advance.

Start with INSTALL and the Makefile target at line 128, then inspect how the build expects the json-cwx directory and its autogen.sh/configure files to be present. Reproduce the make all failure and determine the documented dependency or path correction; done means the proxy app builds without the missing-directory errors.

Written by the indexing model from the issue text.