--- a/closed/OpenJ9.gmk	2020-01-23 11:32:56.700658325 +0100
+++ b/closed/OpenJ9.gmk	2020-01-23 11:48:34.737730143 +0100
@@ -29,15 +29,15 @@
   BUILD_ID := 000000
 endif
 
-OPENJ9_SHA := $(shell git -C $(OPENJ9_TOPDIR) rev-parse --short HEAD)
+OPENJ9_SHA := @OPENJ9_SHA@
 ifeq (,$(OPENJ9_SHA))
   $(error Could not determine OpenJ9 SHA)
 endif
 
 # Find OpenJ9 tag associated with current commit (suppressing stderr in case there is no such tag).
-OPENJ9_TAG := $(shell git -C $(OPENJ9_TOPDIR) describe --exact-match HEAD 2>/dev/null)
+OPENJ9_TAG := @OPENJ9_TAG@
 ifeq (,$(OPENJ9_TAG))
-  OPENJ9_BRANCH := $(shell git -C $(OPENJ9_TOPDIR) rev-parse --abbrev-ref HEAD)
+  OPENJ9_BRANCH := @OPENJ9_BRANCH@
   ifeq (,$(OPENJ9_BRANCH))
     $(error Could not determine OpenJ9 branch)
   endif
@@ -46,7 +46,7 @@
   OPENJ9_VERSION_STRING := $(OPENJ9_TAG)
 endif
 
-OPENJ9OMR_SHA := $(shell git -C $(OPENJ9OMR_TOPDIR) rev-parse --short HEAD)
+OPENJ9OMR_SHA := @OPENJ9OMR_SHA@
 ifeq (,$(OPENJ9OMR_SHA))
   $(error Could not determine OMR SHA)
 endif