diff --git a/documentation/Makefile b/documentation/Makefile
index d8e3b6a1d..bd527e7db 100644
--- a/documentation/Makefile
+++ b/documentation/Makefile
@@ -1,7 +1,7 @@
 TOP = ..
 include $(TOP)/configure/CONFIG
 
-ifdef T_A
+ifeq ($(T_A),$(EPICS_HOST_ARCH))
 
 DOXYGEN=doxygen
 
@@ -14,6 +14,7 @@ EXPAND_ME += EPICS_PATCH_LEVEL
 EXPAND_ME += OS_CLASS CMPLR_CLASS
 
 ME = documentation/O.$(T_A)/html
+GH_FILES = $(ME)/ $(ME)/.nojekyll $(ME)/*.* $(ME)/*/*.*
 
 install: doxygen
 
@@ -25,10 +26,10 @@ doxygen: Doxyfile ../mainpage.dox
 
 commit: doxygen
 	$(TOUCH) html/.nojekyll
-	(cd $(TOP) && $(CURDIR)/../commit-gh.sh $(ME)/ $(ME)/.nojekyll $(ME)/*.* $(ME)/*/*.*)
+	(cd $(TOP) && $(CURDIR)/../commit-gh.sh $(GH_FILES))
 
 .PHONY: commit
 
-endif # T_A
+endif # EPICS_HOST_ARCH
 
 include $(TOP)/configure/RULES