Server Side C programming Environment Set up

I read a lot of document and did some search and looked at the source
code of postgres but did not find a simple
solution to my question.

How to set up the programming environment for C.

IN chapter 33 Extending SQL
33.7.5 Writing Code
when run pg_config --includedir-server
I got /usr/local/pgsql/include/server but my machine does have this
directory

I looked at configure --help, no mentioning about how to install server
side include and lib files.

I do see postgres.h src/include/executor/spi.h
/src/include/commands/trigger.h

located in the source distribution.

Is there a simple configure flag or some program (shell script) in the
source distribution
to set up the programming environment?

Kemin

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