--- php-7.3.19/acinclude.m4.orig	2020-06-26 16:36:23.693451000 +0200
+++ php-7.3.19/acinclude.m4	2020-06-26 16:39:27.844451000 +0200
@@ -2083,8 +2083,10 @@
 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
-  AC_PATH_PROG(PROG_SENDMAIL, sendmail, /usr/sbin/sendmail, $PATH:$PHP_ALT_PATH)
+  if test -z "$PROG_SENDMAIL"; then
+    PHP_ALT_PATH=/usr/bin:/usr/sbin:/usr/etc:/etc:/usr/ucblib:/usr/lib
+    AC_PATH_PROG(PROG_SENDMAIL, sendmail, /usr/sbin/sendmail, $PATH:$PHP_ALT_PATH)
+  fi
   PHP_SUBST(PROG_SENDMAIL)
 ])