--- a/scripts/Makefile.frag
+++ b/scripts/Makefile.frag
@@ -2,7 +2,7 @@
 # Build environment install
 #
 
-phpincludedir = $(includedir)/php
+phpincludedir = $(includedir)/php81
 phpbuilddir = $(libdir)/build
 
 BUILD_FILES = \
--- a/ext/pdo/Makefile.frag
+++ b/ext/pdo/Makefile.frag
@@ -1,4 +1,4 @@
-phpincludedir=$(prefix)/include/php
+phpincludedir=$(prefix)/include/php81
 
 PDO_HEADER_FILES= \
 	php_pdo.h \
--- a/scripts/php-config.in
+++ b/scripts/php-config.in
@@ -6,7 +6,7 @@
 exec_prefix="@exec_prefix@"
 version="@PHP_VERSION@"
 vernum="@PHP_VERSION_ID@"
-include_dir="@includedir@/php"
+include_dir="@includedir@/php81"
 includes="-I$include_dir -I$include_dir/main -I$include_dir/TSRM -I$include_dir/Zend -I$include_dir/ext -I$include_dir/ext/date/lib"
 ldflags="@PHP_LDFLAGS@"
 libs="@EXTRA_LIBS@"
--- a/scripts/phpize.in
+++ b/scripts/phpize.in
@@ -5,7 +5,7 @@
 datarootdir='@datarootdir@'
 exec_prefix="`eval echo @exec_prefix@`"
 phpdir="`eval echo @libdir@`/build"
-includedir="`eval echo @includedir@`/php"
+includedir="`eval echo @includedir@`/php81"
 builddir="`pwd`"
 SED="@SED@"