diff -uNr qemu-2.12.1/block.c qemu-2.12.1.mod/block.c
--- qemu-2.12.1/block.c	2018-08-03 00:48:53.000000000 +0300
+++ qemu-2.12.1.mod/block.c	2018-09-17 16:27:46.960728928 +0300
@@ -544,7 +544,7 @@
     const char *tmpdir;
     tmpdir = getenv("TMPDIR");
     if (!tmpdir) {
-        tmpdir = "/var/tmp";
+        tmpdir = "@TERMUX_PREFIX@/var/tmp";
     }
     if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) {
         return -EOVERFLOW;