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diff -up mozilla-release/configure.in.old mozilla-release/configure.in
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--- mozilla-release/configure.in.old	2015-04-28 20:31:45.000000000 +0200
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+++ mozilla-release/configure.in	2015-04-28 20:32:40.807783614 +0200
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@@ -3627,7 +3627,7 @@ MOZ_ARG_WITH_BOOL(system-nss,
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     _USE_SYSTEM_NSS=1 )
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 if test -n "$_USE_SYSTEM_NSS"; then
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-    AM_PATH_NSS(3.18.1, [MOZ_NATIVE_NSS=1], [AC_MSG_ERROR([you don't have NSS installed or your version is too old])])
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+    AM_PATH_NSS(3.18.0, [MOZ_NATIVE_NSS=1], [AC_MSG_ERROR([you don't have NSS installed or your version is too old])])
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 fi
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 if test -n "$MOZ_NATIVE_NSS"; then