Update build instructions (#5764)

The Rust version in CentOS 7 SCL is too old to build cryptography. Signed-off-by: Christian Heimes <cheimes@redhat.com>
pyca · Feb 8, 2021 · 9aa369a · 9aa369a
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diff --git a/docs/installation.rst b/docs/installation.rst
@@ -103,16 +103,16 @@ Debian/Ubuntu
 
 .. code-block:: console
 
-    $ sudo apt-get install build-essential libssl-dev libffi-dev python3-dev
+    $ sudo apt-get install build-essential libssl-dev libffi-dev \
+        python3-dev cargo
 
-RHEL/CentOS
-~~~~~~~~~~~
+Fedora/RHEL 8/CentOS 8
+~~~~~~~~~~~~~~~~~~~~~~
 
 .. code-block:: console
 
-    $ sudo yum install redhat-rpm-config gcc libffi-devel python-devel \
-        openssl-devel
-
+    $ sudo dnf install redhat-rpm-config gcc libffi-devel python3-devel \
+        openssl-devel cargo
 
 Building
 ~~~~~~~~

diff --git a/docs/spelling_wordlist.txt b/docs/spelling_wordlist.txt
@@ -14,6 +14,7 @@ Botan
 Brainpool
 Bullseye
 Capitan
+CentOS
 changelog
 Changelog
 ciphertext
@@ -80,6 +81,7 @@ online
 paddings
 Parallelization
 personalization
+RHEL
 pickleable
 plaintext
 Poly