diff -uNr fltk-1.3.4/src/Fl_x.cxx fltk-1.3.4.mod/src/Fl_x.cxx
--- fltk-1.3.4/src/Fl_x.cxx	2016-10-14 19:35:44.000000000 +0300
+++ fltk-1.3.4.mod/src/Fl_x.cxx	2017-12-10 15:13:22.701039128 +0200
@@ -1481,9 +1481,9 @@
     if (!fl_selection_requestor) return 0;
     if (Fl::e_clipboard_type == Fl::clipboard_image) {
       if (bytesread == 0) return 0;
-      static char tmp_fname[21];
+      static char tmp_fname[52] = {0};
       static Fl_Shared_Image *shared = 0;
-      strcpy(tmp_fname, "/tmp/clipboardXXXXXX");
+      strcpy(tmp_fname, "/data/data/com.termux/files/usr/tmp/clipboardXXXXXX");
       int fd = mkstemp(tmp_fname);
       if (fd == -1) return 0;
       uchar *p = sn_buffer; ssize_t towrite = bytesread, written;