--- a/src/bin/initdb/initdb.c
+++ b/src/bin/initdb/initdb.c
@@ -81,6 +81,64 @@
 #include "mb/pg_wchar.h"
 #include "miscadmin.h"
 
+static int shm_open(const char *name, int oflag, mode_t mode) {
+    size_t namelen;
+    char *fname;
+    int fd;
+
+    /* Construct the filename.  */
+    while (name[0] == '/') ++name;
+
+    if (name[0] == '\0') {
+        /* The name "/" is not supported.  */
+        errno = EINVAL;
+        return -1;
+    }
+
+    namelen = strlen(name);
+    fname = (char *) alloca(sizeof("@TERMUX_PREFIX@/tmp/") - 1 + namelen + 1);
+    memcpy(fname, "@TERMUX_PREFIX@/tmp/", sizeof("@TERMUX_PREFIX@/tmp/") - 1);
+    memcpy(fname + sizeof("@TERMUX_PREFIX@/tmp/") - 1, name, namelen + 1);
+
+    fd = open(fname, oflag, mode);
+    if (fd != -1) {
+        /* We got a descriptor.  Now set the FD_CLOEXEC bit.  */
+        int flags = fcntl(fd, F_GETFD, 0);
+        flags |= FD_CLOEXEC;
+        flags = fcntl(fd, F_SETFD, flags);
+
+        if (flags == -1) {
+            /* Something went wrong.  We cannot return the descriptor.  */
+            int save_errno = errno;
+            close(fd);
+            fd = -1;
+            errno = save_errno;
+        }
+    }
+
+    return fd;
+}
+
+static int shm_unlink(const char *name) {
+    size_t namelen;
+    char *fname;
+
+    /* Construct the filename.  */
+    while (name[0] == '/') ++name;
+
+    if (name[0] == '\0') {
+        /* The name "/" is not supported.  */
+        errno = EINVAL;
+        return -1;
+    }
+
+    namelen = strlen(name);
+    fname = (char *) alloca(sizeof("@TERMUX_PREFIX@/tmp/") - 1 + namelen + 1);
+    memcpy(fname, "@TERMUX_PREFIX@/tmp/", sizeof("@TERMUX_PREFIX@/tmp/") - 1);
+    memcpy(fname + sizeof("@TERMUX_PREFIX@/tmp/") - 1, name, namelen + 1);
+
+    return unlink(fname);
+}
 
 /* Ideally this would be in a .h file, but it hardly seems worth the trouble */
 extern const char *select_default_timezone(const char *share_path);
@@ -135,8 +193,8 @@
 
 /* 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;
@@ -1006,6 +1064,9 @@
 static const char *
 choose_dsm_implementation(void)
 {
+#if defined(__ANDROID__)
+    return "mmap";
+#endif
 #if defined(HAVE_SHM_OPEN) && !defined(__sun__)
 	int			ntries = 10;
 	pg_prng_state prng_state;