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-rw-r--r--src/test/regress/GNUmakefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/test/regress/GNUmakefile b/src/test/regress/GNUmakefile
index dee68624c5b..523be640424 100644
--- a/src/test/regress/GNUmakefile
+++ b/src/test/regress/GNUmakefile
@@ -40,7 +40,7 @@ pg_regress$(X): pg_regress.o pg_regress_main.o $(WIN32RES) | submake-libpgport
# dependencies ensure that path changes propagate
pg_regress.o: pg_regress.c $(top_builddir)/src/port/pg_config_paths.h
-pg_regress.o: override CPPFLAGS += -I$(top_builddir)/src/port -I$(libpq_srcdir) $(EXTRADEFS)
+pg_regress.o: override CPPFLAGS := -I$(top_builddir)/src/port -I$(libpq_srcdir) $(EXTRADEFS) $(CPPFLAGS)
# note: because of the submake dependency, this rule's action is really a no-op
$(top_builddir)/src/port/pg_config_paths.h: | submake-libpgport