diff -Nru openssh-8.4p1/debian/changelog openssh-8.4p1/debian/changelog
--- openssh-8.4p1/debian/changelog	2021-08-26 13:51:02.000000000 -0500
+++ openssh-8.4p1/debian/changelog	2021-09-21 17:08:39.000000000 -0500
@@ -1,3 +1,10 @@
+openssh (1:8.4p1-6ubuntu2) impish; urgency=medium
+
+  * Configure with ac_cv_func_closefrom=no to avoid an incompatibility
+    with glibc 2.34's fallback_closefrom function (LP: #1944621)
+
+ -- William 'jawn-smith' Wilson <william.wilson@canonical.com>  Tue, 21 Sep 2021 22:08:39 +0000
+
 openssh (1:8.4p1-6ubuntu1) impish; urgency=low
 
   * Merge from Debian unstable (LP: #1941799). Remaining changes:
diff -Nru openssh-8.4p1/debian/rules openssh-8.4p1/debian/rules
--- openssh-8.4p1/debian/rules	2021-08-26 13:51:02.000000000 -0500
+++ openssh-8.4p1/debian/rules	2021-09-21 17:08:39.000000000 -0500
@@ -85,6 +85,9 @@
 confflags += --with-security-key-builtin
 endif
 
+# This handles an issue with closefrom in glibc 2.34
+confflags += ac_cv_func_closefrom=no
+
 # The deb build wants xauth; the udeb build doesn't.
 confflags += --with-xauth=/usr/bin/xauth
 confflags_udeb += --without-xauth