diff -uNr qemu-2.12.0/block.c qemu-2.12.0.mod/block.c
--- qemu-2.12.0/block.c	2018-04-24 19:30:46.000000000 +0300
+++ qemu-2.12.0.mod/block.c	2018-06-25 14:11:33.210632119 +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;