diff --git a/.github/workflows/presubmit.yml b/.github/workflows/presubmit.yml
index 605571254..bf8dbef59 100644
--- a/.github/workflows/presubmit.yml
+++ b/.github/workflows/presubmit.yml
@@ -3,12 +3,41 @@ name: Presubmit
 permissions:
   contents: read
 
-on: [push, pull_request]
+# Controls when the action will run.
+on:
+  push:
+  workflow_dispatch:
+  pull_request:
 
 jobs:
+
+#   checkout:
+#     name: Checkout repository and setup build
+#     runs-on: ubuntu-latest
+#     # Refer to the khronosgroup/docker-images:asciidoctor-spec container by
+#     # its SHA instead of the name, to prevent caching problems when updating
+#     # the image.
+#     container: khronosgroup/docker-images@sha256:bd30a83285a2ea062598f053b5bd8ebc843e16c639c0e4cd88ab4bbb4e63ead3
+#
+#     steps:
+#       - uses: actions/checkout@v4
+#         with:
+#           fetch-depth: 0
+#           submodules: recursive
+#       # Ownerships in the working directory are odd.
+#       # . is owned by UID 1001, while repo files are owned by root
+#       # This leads to many odd messages like
+#       #     fatal: detected dubious ownership in repository at '/__w/OpenCL-Docs/OpenCL-Docs'
+#       - name: Git safe directory workaround
+#         run: |
+#             git config --global --add safe.directory '*'
+
+  # These steps are potentially parallelizeable
   build:
-    name: Build all specs
+    name: Build spec artifacts
     runs-on: ubuntu-latest
+    # needs: checkout
+    container: khronosgroup/docker-images@sha256:bd30a83285a2ea062598f053b5bd8ebc843e16c639c0e4cd88ab4bbb4e63ead3
 
     steps:
       - uses: actions/checkout@v4
@@ -16,34 +45,32 @@ jobs:
           fetch-depth: 0
           submodules: recursive
 
-      - name: Install required packages
+      # Ownerships in the working directory are odd.
+      # . is owned by UID 1001, while repo files are owned by root
+      # This leads to many odd messages like
+      #     fatal: detected dubious ownership in repository at '/__w/OpenCL-Docs/OpenCL-Docs'
+      - name: Git safe directory workaround
         run: |
-          sudo apt-get install -y libpango1.0-dev libwebp-dev ghostscript fonts-lyx jing libavalon-framework-java libbatik-java python3-pyparsing
-          sudo gem install asciidoctor -v 2.0.16
-          sudo gem install coderay -v 1.1.1
-          sudo gem install rouge -v 3.19.0
-          sudo gem install ttfunk -v 1.7.0
-          sudo gem install hexapdf -v 0.27.0
-          sudo gem install asciidoctor-pdf -v 2.3.4
-          sudo gem install asciidoctor-mathematical -v 0.3.5
-          sudo pip install pyparsing
+            git config --global --add safe.directory '*'
+            ls -lda . .. .git Makefile
 
       - name: List git tag
         run: |
           git describe --tags --dirty
 
+      - name: Validate XML
+        run: |
+          make -C xml validate
+
       - name: Generate core specs (HTML and PDF)
+        # May also want to generate PDF targets
         run: |
-          python3 makeSpec -clean -spec core OUTDIR=out.core -j 5 api c env ext cxx4opencl
-          
+          python3 makeSpec -clean -spec core OUTDIR=out.core -j 5 -O apihtml chtml envhtml exthtml cxx4openclhtml
+
       - name: Generate core + extension specs (HTML)
         run: |
-          python3 makeSpec -clean -spec khr OUTDIR=out.khr -j 12 html
+          python3 makeSpec -clean -spec khr OUTDIR=out.khr -j -O html
 
       - name: Generate reference pages
         run: |
-          python3 makeSpec -spec khr OUTDIR=out.refpages -j 12 manhtmlpages
-
-      - name: Validate XML
-        run: |
-          make -C xml validate
+          python3 makeSpec -spec khr OUTDIR=out.refpages -j 12 -O manhtmlpages
diff --git a/Makefile b/Makefile
index 1540b8343..224771730 100644
--- a/Makefile
+++ b/Makefile
@@ -14,6 +14,7 @@ EXTOPTIONS := $(foreach ext,$(EXTS),-extension $(ext))
 
 QUIET	    ?=
 VERYQUIET   ?= @
+PYTHON	    ?= python3
 ASCIIDOCTOR ?= asciidoctor
 RM	    = rm -f
 RMRF	    = rm -rf
@@ -545,6 +546,7 @@ $(METADEPEND): $(APIXML) $(GENSCRIPT)
 attribs: $(ATTRIBFILE)
 
 $(ATTRIBFILE):
+	$(QUIET)$(MKDIR) $(dir $@)
 	for attrib in $(EXTS) ; do \
 	    echo ":$${attrib}:" ; \
 	done > $@