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-rw-r--r--cppflags-iterator.mk2
1 files changed, 1 insertions, 1 deletions
diff --git a/cppflags-iterator.mk b/cppflags-iterator.mk
index 5f3bcc0668..790d345a0a 100644
--- a/cppflags-iterator.mk
+++ b/cppflags-iterator.mk
@@ -4,4 +4,4 @@
cpp-src := $(firstword $(cpp-srcs-left))
cpp-srcs-left := $(filter-out $(cpp-src),$(cpp-srcs-left))
-CPPFLAGS-$(cpp-src) = -DNOT_IN_libc -DIS_IN_$(lib)
+CPPFLAGS-$(cpp-src) += -DNOT_IN_libc -DIS_IN_$(lib)