https://sources.debian.org/data/main/r/rust-openssl-sys/0.9.53-1/debian/patches/disable-vendor.patch
"MIT" licensed according to debian/copyright file
slightly modified to only change the vendored openssl-src dependency

Starting from rust-openssl-sys@0.9.69 Cargo.toml starts searching for openssl-3.0.

--- a/Cargo.toml
+++ b/Cargo.toml
@@ -31,15 +31,12 @@
 [build-dependencies.cc]
 version = "1.0"
 
-[build-dependencies.openssl-src]
-version = "111"
-optional = true
-
 [build-dependencies.pkg-config]
 version = "0.3.9"
 
 [features]
 vendored = ["openssl-src"]
+openssl-src = []
 
 [target."cfg(target_env = \"msvc\")".build-dependencies.vcpkg]
 version = "0.2.8"

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<tr><td><span title='2020-05-28 10:21:23 +0200'>2020-05-28</span></td><td><a href='/guix/commit/build-aux/update-guix-package.scm?id=ccd9107ed9e8b918c6fb521cc69ac459fe4257ac'>update-guix-package: Use 'origin-hash'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/package-management.scm (main): Use 'origin-hash' instead
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Signed-off-by: Tobias Geerinckx-Rice &lt;me@tobias.gr&gt;
</span></span></td><td>Vincent Legoll</td></tr>