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diff -up nss/coreconf/location.mk.iquote nss/coreconf/location.mk
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--- nss/coreconf/location.mk.iquote	2017-07-27 16:09:32.000000000 +0200
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+++ nss/coreconf/location.mk	2017-08-30 15:17:56.553361830 +0200
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@@ -75,4 +75,9 @@ ifndef SQLITE_LIB_NAME
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     SQLITE_LIB_NAME = sqlite3
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 endif
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+# Prefer in-tree headers over system headers
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+ifdef IN_TREE_FREEBL_HEADERS_FIRST
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+    INCLUDES += -iquote $(DIST)/../public/nss -iquote $(DIST)/../private/nss
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+endif
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+
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 MK_LOCATION = included