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diff -up thunderbird-102.4.0/comm/third_party/rnp/moz.build.rnp-openssl thunderbird-102.4.0/comm/third_party/rnp/moz.build
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--- thunderbird-102.4.0/comm/third_party/rnp/moz.build.rnp-openssl	2022-11-01 14:36:02.940726858 +0100
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+++ thunderbird-102.4.0/comm/third_party/rnp/moz.build	2022-11-01 14:36:23.091726917 +0100
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@@ -39,7 +39,7 @@ if CONFIG["CC_TYPE"] == "clang-cl":
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 rnp_defines = {
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     "HAVE_BZLIB_H": True,
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     "HAVE_ZLIB_H": True,
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-    "CRYPTO_BACKEND_BOTAN": True,
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+    "CRYPTO_BACKEND_OPENSSL": True,
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     "ENABLE_AEAD": True,
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     "ENABLE_TWOFISH": True,
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     "ENABLE_BRAINPOOL": True,