diff -urNp -x '*.orig' php-7.1.33.org/ext/mcrypt/config.m4 php-7.1.33/ext/mcrypt/config.m4
--- php-7.1.33.org/ext/mcrypt/config.m4	2019-10-22 18:59:57.000000000 +0200
+++ php-7.1.33/ext/mcrypt/config.m4	2021-08-23 23:46:54.877961825 +0200
@@ -36,7 +36,6 @@ if test "$PHP_MCRYPT" != "no"; then
 
   PHP_CHECK_LIBRARY(mcrypt, mcrypt_module_open,
   [
-    PHP_ADD_LIBRARY(ltdl,, MCRYPT_SHARED_LIBADD)
     AC_DEFINE(HAVE_LIBMCRYPT,1,[ ])
   ],[
     PHP_CHECK_LIBRARY(mcrypt, mcrypt_module_open,
@@ -48,7 +47,7 @@ if test "$PHP_MCRYPT" != "no"; then
       -L$MCRYPT_DIR/$PHP_LIBDIR
     ])
   ],[
-    -L$MCRYPT_DIR/$PHP_LIBDIR -lltdl
+    -L$MCRYPT_DIR/$PHP_LIBDIR
   ])
 
   PHP_ADD_LIBRARY_WITH_PATH(mcrypt, $MCRYPT_DIR/$PHP_LIBDIR, MCRYPT_SHARED_LIBADD)