RTD to build doxygen xml before using Sphinx

.readthedocs.yml

@@ -7,6 +7,10 @@ version: 2
 
 build:
   apt_packages:
+    - build-essential 
+    - libtool 
+    - autoconf 
+    - automake
     - doxygen
 
 # Build documentation in the docs/ directory with Sphinx