diff --git a/security/sssd/files/patch-configure.ac b/security/sssd/files/patch-configure.ac
index 26284c2f63..bf41998720 100644
--- a/security/sssd/files/patch-configure.ac
+++ b/security/sssd/files/patch-configure.ac
@@ -1,7 +1,7 @@
 diff --git configure.ac configure.ac
 index 9df463d9c..17d0d9ea7 100644
 --- configure.ac
-+++ configure.ac
++++ configure.ac	2021-10-13 16:29:18.263955000 -0400
 @@ -44,8 +44,6 @@ AM_CONDITIONAL([HAVE_GCC], [test "$ac_cv_prog_gcc" = yes])
  AC_CHECK_HEADERS(stdint.h dlfcn.h)
  AC_CONFIG_HEADER(config.h)
@@ -11,3 +11,19 @@ index 9df463d9c..17d0d9ea7 100644
  m4_include([src/build_macros.m4])
  BUILD_WITH_SHARED_BUILD_DIR
  
+@@ -62,4 +60,15 @@
+ 
+ AM_CONDITIONAL([HAVE_PTHREAD], [test x"$HAVE_PTHREAD" != "x"])
++
++AC_COMPILE_IFELSE(
++    [AC_LANG_PROGRAM([[#include <string.h>]],
++        [[(void)mempcpy(NULL, NULL, 0);]])],
++    [AC_DEFINE([HAVE_MEMPCPY], [1], [mempcpy() available])
++     HAVE_MEMPCPY=1
++    ],
++    [AC_MSG_WARN([mempcpy() not found, will use private implementation])])
++
++
++AM_CONDITIONAL([HAVE_MEMPCPY], [test x"$HAVE_MEMPCPY" != "x"])
+ 
+ # Check library for the timer_create function
diff --git a/security/sssd/files/patch-src__util__crypto__nss__nss_sha512crypt.c b/security/sssd/files/patch-src__util__crypto__nss__nss_sha512crypt.c
index aa1efee665..fbce0c0e29 100644
--- a/security/sssd/files/patch-src__util__crypto__nss__nss_sha512crypt.c
+++ b/security/sssd/files/patch-src__util__crypto__nss__nss_sha512crypt.c
@@ -2,15 +2,17 @@ diff --git src/util/crypto/nss/nss_sha512crypt.c src/util/crypto/nss/nss_sha512c
 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[] = "$6$";