diff --git a/sys-auth/pam-pgsql/files/pam-pgsql-0.7.3.2-Fix-crypt-implicit-function-declaration.patch b/sys-auth/pam-pgsql/files/pam-pgsql-0.7.3.2-Fix-crypt-implicit-function-declaration.patch
new file mode 100644
index 000000000000..bf3604fd5670
--- /dev/null
+++ b/sys-auth/pam-pgsql/files/pam-pgsql-0.7.3.2-Fix-crypt-implicit-function-declaration.patch
@@ -0,0 +1,18 @@
+From: Sam James <sam@gentoo.org>
+Date: Sun, 2 Oct 2022 23:55:21 +0100
+Subject: [PATCH] Fix crypt() implicit function declaration
+
+crypt() is POSIX and setting _XOPEN_SOURCE makes glibc inhibit
+defining it w/o _DEFAULT_SOURCE.
+
+Bug: https://bugs.gentoo.org/871492
+--- a/src/backend_pgsql.c
++++ b/src/backend_pgsql.c
+@@ -8,7 +8,6 @@
+  * William Grzybowski <william@agencialivre.com.br>
+  */
+ 
+-#define _XOPEN_SOURCE 500
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <stdarg.h>
diff --git a/sys-auth/pam-pgsql/pam-pgsql-0.7.3.2-r1.ebuild b/sys-auth/pam-pgsql/pam-pgsql-0.7.3.2-r2.ebuild
similarity index 90%
rename from sys-auth/pam-pgsql/pam-pgsql-0.7.3.2-r1.ebuild
rename to sys-auth/pam-pgsql/pam-pgsql-0.7.3.2-r2.ebuild
index 656ce64960a5..cf3ad756ccad 100644
--- a/sys-auth/pam-pgsql/pam-pgsql-0.7.3.2-r1.ebuild
+++ b/sys-auth/pam-pgsql/pam-pgsql-0.7.3.2-r2.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2021 Gentoo Authors
+# Copyright 1999-2022 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=7
@@ -24,6 +24,10 @@ RDEPEND=">=dev-db/postgresql-8.0:=
 	virtual/libcrypt:="
 DEPEND="${RDEPEND}"
 
+PATCHES=(
+	"${FILESDIR}"/${PN}-0.7.3.2-Fix-crypt-implicit-function-declaration.patch
+)
+
 src_configure() {
 	econf \
 		--sysconfdir=/etc/security \