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-rw-r--r--src/makefiles/pgxs.mk10
1 files changed, 10 insertions, 0 deletions
diff --git a/src/makefiles/pgxs.mk b/src/makefiles/pgxs.mk
index 7dc874240ac..318d5ef3070 100644
--- a/src/makefiles/pgxs.mk
+++ b/src/makefiles/pgxs.mk
@@ -64,6 +64,16 @@ include $(top_builddir)/src/Makefile.global
top_srcdir = $(top_builddir)
srcdir = .
VPATH =
+
+# These might be set in Makefile.global, but if they were not found
+# during the build of PostgreSQL, supply default values so that users
+# of pgxs can use the variables.
+ifeq ($(BISON),)
+BISON = bison
+endif
+ifeq ($(FLEX),)
+FLEX = flex
+endif
endif