Index: pgbackrest-release-2.52.1/src/postgres/client.c
===================================================================
--- pgbackrest-release-2.52.1.orig/src/postgres/client.c
+++ pgbackrest-release-2.52.1/src/postgres/client.c
@@ -3,7 +3,7 @@ Postgres Client
 ***********************************************************************************************************************************/
 #include "build.auto.h"
 
-#include <libpq-fe.h>
+#include <pgsql/libpq-fe.h>
 
 #include "common/debug.h"
 #include "common/log.h"
Index: pgbackrest-release-2.52.1/src/configure
===================================================================
--- pgbackrest-release-2.52.1.orig/src/configure
+++ pgbackrest-release-2.52.1/src/configure
@@ -3655,12 +3655,12 @@ else $as_nop
   as_fn_error $? "library 'pq' is required" "$LINENO" 5
 fi
 
-ac_fn_c_check_header_compile "$LINENO" "libpq-fe.h" "ac_cv_header_libpq_fe_h" "$ac_includes_default"
+ac_fn_c_check_header_compile "$LINENO" "pgsql/libpq-fe.h" "ac_cv_header_libpq_fe_h" "$ac_includes_default"
 if test "x$ac_cv_header_libpq_fe_h" = xyes
 then :
 
 else $as_nop
-  as_fn_error $? "header file <libpq-fe.h> is required" "$LINENO" 5
+  as_fn_error $? "header file <pgsql/libpq-fe.h> is required" "$LINENO" 5
 fi