diff -Naur php-7.3.19/acinclude.m4 php-7.3.19-magellan/acinclude.m4
--- php-7.3.19/acinclude.m4	2020-06-09 10:06:39.000000000 +0200
+++ php-7.3.19-magellan/acinclude.m4	2020-07-09 09:14:10.666930144 +0200
@@ -443,7 +443,7 @@
 dnl Adds a path to linkpath/runpath (LDFLAGS)
 dnl
 AC_DEFUN([PHP_ADD_LIBPATH],[
-  if test "$1" != "/usr/$PHP_LIBDIR" && test "$1" != "/usr/lib"; then
+  if test "$1" != "/usr/$PHP_LIBDIR" && test "$1" != "/usr/lib" && test "$1" != "/usr/lib64"; then
     PHP_EXPAND_PATH($1, ai_p)
     ifelse([$2],,[
       _PHP_ADD_LIBPATH_GLOBAL([$ai_p])
@@ -2083,7 +2083,7 @@
 dnl Search for the sendmail binary
 dnl
 AC_DEFUN([PHP_PROG_SENDMAIL], [
-  PHP_ALT_PATH=/usr/bin:/usr/sbin:/usr/etc:/etc:/usr/ucblib:/usr/lib
+  PHP_ALT_PATH=/usr/bin:/usr/sbin:/usr/etc:/etc:/usr/ucblib:/usr/lib:/usr/lib64
   AC_PATH_PROG(PROG_SENDMAIL, sendmail, /usr/sbin/sendmail, $PATH:$PHP_ALT_PATH)
   PHP_SUBST(PROG_SENDMAIL)
 ])