Andrew, is this correct in:   "0001-Add-libjpeg-dep-to.libtiff-in-thirdparty-Makefile.patch"

that is, no comma??? between libwebp and libjpeg ?? as shown below

diff --git a/cinelerra-5.1/thirdparty/Makefile b/cinelerra-5.1/thirdparty/Makefile
index b75858d5..cd8de90e 100644
--- a/cinelerra-5.1/thirdparty/Makefile
+++ b/cinelerra-5.1/thirdparty/Makefile
@@ -367,7 +367,7 @@ $(call rules,$(call std-build,openExr, ilmBase))
 $(call rules,$(call std-build,openjpeg))
 $(call rules,$(call std-build,opus))
 $(call rules,$(call std-build,speech_tools))
-$(call rules,$(call std-build,tiff, libwebp))
+$(call rules,$(call std-build,tiff, libwebp libjpeg))
 $(call rules,$(call std-build,twolame))
 $(call rules,$(call std-build,x264))
 $(call rules,$(call std-build,x265))