diff -uNr qemu-3.0.0/block.c qemu-3.0.0.mod/block.c
--- qemu-3.0.0/block.c	2018-08-14 22:10:34.000000000 +0300
+++ qemu-3.0.0.mod/block.c	2018-10-26 16:49:45.246931666 +0300
@@ -549,7 +549,7 @@
     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;