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diff -up firefox-45.0.1esr/configure.in.nss firefox-45.0.1esr/configure.in
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--- firefox-45.0.1esr/configure.in.nss	2016-04-06 10:20:01.000000000 +0200
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+++ firefox-45.0.1esr/configure.in	2016-04-06 10:25:56.998285981 +0200
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@@ -53,7 +53,7 @@ dnl ====================================
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 MOZJPEG=62
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 MOZPNG=10619
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 NSPR_VERSION=4
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-NSPR_MINVER=4.12
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+NSPR_MINVER=4.11
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 NSS_VERSION=3
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 dnl Set the minimum version of toolkit libs used by mozilla
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@@ -3451,7 +3451,7 @@ MOZ_ARG_WITH_BOOL(system-nss,
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     _USE_SYSTEM_NSS=1 )
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 if test -n "$_USE_SYSTEM_NSS"; then
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-    AM_PATH_NSS(3.21.1, [MOZ_NATIVE_NSS=1], [AC_MSG_ERROR([you don't have NSS installed or your version is too old])])
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+    AM_PATH_NSS(3.21.0, [MOZ_NATIVE_NSS=1], [AC_MSG_ERROR([you don't have NSS installed or your version is too old])])
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 fi
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 if test -n "$MOZ_NATIVE_NSS"; then