diff -uNr postgresql-15.0/src/bin/initdb/initdb.c postgresql-15.0.mod/src/bin/initdb/initdb.c
--- postgresql-15.0/src/bin/initdb/initdb.c	2022-10-10 23:57:37.000000000 +0300
+++ postgresql-15.0.mod/src/bin/initdb/initdb.c	2022-10-21 17:08:03.387801295 +0300
@@ -124,8 +124,8 @@
 
 /* values to be obtained from arguments */
 static char *pg_data = NULL;
-static char *encoding = NULL;
-static char *locale = NULL;
+static char *encoding = "UTF-8";
+static char *locale = "en_US.UTF-8";
 static char *lc_collate = NULL;
 static char *lc_ctype = NULL;
 static char *lc_monetary = NULL;
@@ -849,7 +849,9 @@
 static const char *
 choose_dsm_implementation(void)
 {
-#if defined(HAVE_SHM_OPEN) && !defined(__sun__)
+#if defined(__ANDROID__)
+    return "mmap";
+#elif defined(HAVE_SHM_OPEN) && !defined(__sun__)
 	int			ntries = 10;
 	pg_prng_state prng_state;