How to compile a base plugin

[Guillaume Denis]

Hello,

I am new to GStreamer (and C) and I try to compile one of the base 
plugin to learn (by modifying). After having installed various 
dependencies (including libgstreamer-plugins-base1.0-dev) I get:


$ gcc -c audioecho.c `pkg-config --cflags --libs gstreamer-1.0`
In file included from audioecho.c:60:
audioecho.h:71:1: warning: data definition has no type or storage class
  GST_ELEMENT_REGISTER_DECLARE(audioecho);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
audioecho.h:71:1: warning: type defaults to 'int' in declaration of 
'GST_ELEMENT_REGISTER_DECLARE' [-Wimplicit-int]
audioecho.h:71:1: warning: parameter names (without types) in function 
declaration
audioecho.c:88:40: error: expected ')' before string constant
  GST_ELEMENT_REGISTER_DEFINE (audioecho, "audioecho",
                                         ^~~~~~~~~~~~
                                         )

I guess GST_ELEMENT_REGISTER_DECLARE and GST_ELEMENT_REGISTER_DEFINE 
macros are not defined, but I don't know how to solve this. Many thanks 
for your help! Guillaume