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diff -up firefox-52.0esr/old-configure.in.nss-ver firefox-52.0esr/old-configure.in
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--- firefox-52.0esr/old-configure.in.nss-ver	2017-03-01 10:12:54.668047060 +0100
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+++ firefox-52.0esr/old-configure.in	2017-03-01 10:13:01.733044933 +0100
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@@ -2123,7 +2123,7 @@ MOZ_ARG_WITH_BOOL(system-nss,
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     _USE_SYSTEM_NSS=1 )
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 if test -n "$_USE_SYSTEM_NSS"; then
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-    AM_PATH_NSS(3.28.6, [MOZ_SYSTEM_NSS=1], [AC_MSG_ERROR([you don't have NSS installed or your version is too old])])
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+    AM_PATH_NSS(3.28.4, [MOZ_SYSTEM_NSS=1], [AC_MSG_ERROR([you don't have NSS installed or your version is too old])])
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 fi
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 if test -n "$MOZ_SYSTEM_NSS"; then