diff -ru a/security/sssd/files/patch-configure.ac b/security/sssd/files/patch-configure.ac
--- a/security/sssd/files/patch-configure.ac	2021-10-14 20:16:36.167384000 +0100
+++ b/security/sssd/files/patch-configure.ac	2021-10-15 11:22:11.566650000 +0100
@@ -11,3 +11,33 @@
  m4_include([src/build_macros.m4])
  BUILD_WITH_SHARED_BUILD_DIR
  
+@@ -62,4 +60,18 @@
+
+ AM_CONDITIONAL([HAVE_PTHREAD], [test x"$HAVE_PTHREAD" != "x"])
++
++saved_CFLAGS="$CFLAGS"
++CFLAGS="-Werror"
++AC_COMPILE_IFELSE(
++    [AC_LANG_PROGRAM([[#include <string.h>]],
++        [[(void)mempcpy(NULL, NULL, 0);]])],
++    [AC_DEFINE([HAVE_MEMPCPY], [1], [mempcpy() available])
++     HAVE_MEMPCPY=1
++    ],
++    [AC_MSG_WARN([mempcpy() not found, will use private implementation])])
++
++CFLAGS="$saved_CFLAGS"
++
++AM_CONDITIONAL([HAVE_MEMPCPY], [test x"$HAVE_MEMPCPY" != "x"])
+
+ # Check library for the timer_create function
+@@ -356,8 +358,8 @@ them please use argument --without-python3-bindings wh
+     AM_CHECK_PYTHON_HEADERS([],
+                             AC_MSG_ERROR([Could not find python3 headers]))
+
+-    AC_SUBST([py3execdir], [$pyexecdir])
+-    AC_SUBST([python3dir], [$pythondir])
++    AC_SUBST([py3execdir], [$(eval echo $pyexecdir)])
++    AC_SUBST([python3dir], [$(eval echo $pythondir)])
+     AC_SUBST([PYTHON3_CFLAGS], [$PYTHON_CFLAGS])
+     AC_SUBST([PYTHON3_LIBS], [$PYTHON_LIBS])
+     AC_SUBST([PYTHON3_INCLUDES], [$PYTHON_INCLUDES])
diff -ru a/security/sssd/files/patch-src__util__crypto__libcrypto__crypto_sha512crypt.c b/security/sssd/files/patch-src__util__crypto__libcrypto__crypto_sha512crypt.c
--- a/security/sssd/files/patch-src__util__crypto__libcrypto__crypto_sha512crypt.c	2021-10-14 20:16:36.168891000 +0100
+++ b/security/sssd/files/patch-src__util__crypto__libcrypto__crypto_sha512crypt.c	2021-10-14 20:16:49.370797000 +0100
@@ -2,15 +2,17 @@
 index 2275ccd96..c1e418917 100644
 --- src/util/crypto/libcrypto/crypto_sha512crypt.c
 +++ src/util/crypto/libcrypto/crypto_sha512crypt.c
-@@ -30,6 +30,11 @@
+@@ -30,6 +30,13 @@
  
  #include "sss_openssl.h"
  
++#ifndef HAVE_MEMPCPY
 +void *
 +mempcpy (void *dest, const void *src, size_t n)
 +{
 +  return (char *) memcpy (dest, src, n) + n;
 +}
++#endif /* HAVE_MEMPCPY */
  
  /* Define our magic string to mark salt for SHA512 "encryption" replacement. */
  const char sha512_salt_prefix[] = "$6$";
diff -ru a/security/sssd/files/patch-src__util__crypto__nss__nss_sha512crypt.c b/security/sssd/files/patch-src__util__crypto__nss__nss_sha512crypt.c
--- a/security/sssd/files/patch-src__util__crypto__nss__nss_sha512crypt.c	2021-10-14 20:16:36.169059000 +0100
+++ b/security/sssd/files/patch-src__util__crypto__nss__nss_sha512crypt.c	2021-10-14 20:16:49.370728000 +0100
@@ -2,15 +2,17 @@
 index 4d0594d9f..49801222d 100644
 --- src/util/crypto/nss/nss_sha512crypt.c
 +++ src/util/crypto/nss/nss_sha512crypt.c
-@@ -29,6 +29,12 @@
+@@ -29,6 +29,14 @@
  #include <sechash.h>
  #include <pk11func.h>
  
++#ifndef HAVE_MEMPCPY
 +static void *
 +mempcpy (void *dest, const void *src, size_t n)
 +{
 +  return (char *) memcpy (dest, src, n) + n;
 +}
++#endif /* HAVE_MEMPCPY */
 +
  /* Define our magic string to mark salt for SHA512 "encryption" replacement. */
  const char sha512_salt_prefix[] = "$6$";