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-rw-r--r--util/cbfstool/Makefile.inc2
1 files changed, 1 insertions, 1 deletions
diff --git a/util/cbfstool/Makefile.inc b/util/cbfstool/Makefile.inc
index dde8c68ea2..976f0c294b 100644
--- a/util/cbfstool/Makefile.inc
+++ b/util/cbfstool/Makefile.inc
@@ -45,7 +45,7 @@ TOOLCFLAGS ?= -std=c99 -Werror -Wall -Wextra
TOOLCFLAGS += -Wcast-qual -Wmissing-prototypes -Wredundant-decls -Wshadow
TOOLCFLAGS += -Wstrict-prototypes -Wwrite-strings
TOOLCPPFLAGS ?= -D_DEFAULT_SOURCE # memccpy() from string.h
-TOOLCPPFLAGS += -D_POSIX_C_SOURCE=200809L # strdup() from string.h
+TOOLCPPFLAGS += -D_XOPEN_SOURCE=700 # strdup() from string.h
TOOLCPPFLAGS += -I$(top)/util/cbfstool/flashmap
TOOLCPPFLAGS += -I$(top)/util/cbfstool
TOOLCPPFLAGS += -I$(objutil)/cbfstool