From 6811089dbf34a2cef9799e1cb6d63b863b58739f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Esser?= <besser82@fedoraproject.org>
Date: Sun, 21 Jan 2018 18:55:31 +0100
Subject: [PATCH] cryptmodule: Include <crypt.h> for declaration of crypt() if
 needed

Not every target system may provide a crypt() function in its stdlibc
and may use an external or replacement library, like libxcrypt, for
providing such functions.
---
 Modules/_cryptmodule.c | 4 ++++
 configure.ac           | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/Modules/_cryptmodule.c b/Modules/_cryptmodule.c
index 58d179e6a3..bb26d83f55 100644
--- a/Modules/_cryptmodule.c
+++ b/Modules/_cryptmodule.c
@@ -5,6 +5,10 @@
 
 #include <sys/types.h>
 
+#if defined(HAVE_XCRYPT)
+#include <crypt.h>
+#endif
+
 /* Module crypt */
 
 /*[clinic input]
diff --git a/configure.ac b/configure.ac
index 39e2e8e769..129c198c15 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2816,6 +2816,10 @@ LIBS="$withval $LIBS"
 
 PKG_PROG_PKG_CONFIG
 
+# Check for libxcrypt is present.
+PKG_CHECK_MODULES([libxcrypt], libxcrypt,
+            AC_DEFINE([HAVE_XCRYPT], 1, [Define to 1 if libxcrypt is found.]), [])
+
 # Check for use of the system expat library
 AC_MSG_CHECKING(for --with-system-expat)
 AC_ARG_WITH(system_expat,
-- 
2.16.0