trying to pin dependencies to fix compile error for v4r3

Author: ifenty

.readthedocs.yaml

@@ -9,7 +9,7 @@ version: 2
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.7"
+    python: "3.10"
       # You can also specify other tool versions:
       # nodejs: "19"
       # rust: "1.64"
@@ -19,9 +19,9 @@ build:
 sphinx:
   configuration: doc/conf.py
 
-# # If using Sphinx, optionally build your docs in additional formats such as PDF
-# formats:
-# - pdf
+# If using Sphinx, optionally build your docs in additional formats such as PDF
+formats:
+  - pdf
 
 # Optionally declare the Python requirements required to build your docs
 python:

requirements.txt

@@ -1,5 +1,50 @@
-sphinx
+# removed ian 2023-05-08 sphinx
 sphinx_rtd_theme
 cloud_sptheme
 nbsphinx
 ipykernel
+# added ian 2023-05-08  
+alabaster==0.7.12
+    # via sphinx
+babel==2.11.0
+    # via sphinx
+certifi==2022.12.7
+    # via requests
+charset-normalizer==2.1.1
+    # via requests
+docutils==0.19
+    # via sphinx
+idna==3.4
+    # via requests
+imagesize==1.4.1
+    # via sphinx
+jinja2==3.1.2
+    # via sphinx
+markupsafe==2.1.1
+    # via jinja2
+packaging==22.0
+    # via sphinx
+pygments==2.13.0
+    # via sphinx
+pytz==2022.7
+    # via babel
+requests==2.28.1
+    # via sphinx
+snowballstemmer==2.2.0
+    # via sphinx
+sphinx==5.3.0
+    # via -r docs.in
+sphinxcontrib-applehelp==1.0.2
+    # via sphinx
+sphinxcontrib-devhelp==1.0.2
+    # via sphinx
+sphinxcontrib-htmlhelp==2.0.0
+    # via sphinx
+sphinxcontrib-jsmath==1.0.1
+    # via sphinx
+sphinxcontrib-qthelp==1.0.3
+    # via sphinx
+sphinxcontrib-serializinghtml==1.1.5
+    # via sphinx
+urllib3==1.26.13
+    # via requests