diff -uNr fltk-1.3.4/src/Fl_Preferences.cxx fltk-1.3.4.mod/src/Fl_Preferences.cxx
--- fltk-1.3.4/src/Fl_Preferences.cxx	2015-04-25 00:25:30.000000000 +0300
+++ fltk-1.3.4.mod/src/Fl_Preferences.cxx	2017-12-10 15:27:01.280525349 +0200
@@ -963,7 +963,8 @@
   vendor_(0L),
   application_(0L) {
 
-  char filename[ FL_PATH_MAX ]; filename[0] = 0;
+  char filename[ FL_PATH_MAX ] = {0};
+
 #ifdef WIN32
 #  define FLPREFS_RESOURCE	"Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Shell Folders"
 #  define FLPREFS_RESOURCEW	L"Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Shell Folders"
@@ -1049,7 +1050,7 @@
 	break;
       } 
     case SYSTEM:
-      strcpy(filename, "/etc/fltk/");
+      strcpy(filename, "/data/data/com.termux/files/usr/etc/fltk/");
       break;
   } 
   snprintf(filename + strlen(filename), sizeof(filename) - strlen(filename),
@@ -1162,20 +1163,6 @@
   fprintf( f, "; application: %s\n", application_ );
   prefs_->node->write( f );
   fclose( f );
-#if !(defined(__APPLE__) || defined(WIN32))
-  // unix: make sure that system prefs are user-readable
-  if (strncmp(filename_, "/etc/fltk/", 10) == 0) {
-    char *p;
-    p = filename_ + 9;
-    do {			 // for each directory to the pref file
-      *p = 0;
-      fl_chmod(filename_, 0755); // rwxr-xr-x
-      *p = '/';
-      p = strchr(p+1, '/');
-    } while (p);
-    fl_chmod(filename_, 0644);   // rw-r--r--
-  }
-#endif
   return 0;
 }
 
@@ -1191,12 +1178,6 @@
   if ( !s ) return 0;
   *s = 0;
   char ret = fl_make_path( path );
-#if !(defined(__APPLE__) || defined(WIN32))
-  // unix: make sure that system prefs dir. is user-readable
-  if (strncmp(path, "/etc/fltk/", 10) == 0) {
-    fl_chmod(path, 0755); // rwxr-xr-x
-  }
-#endif
   strcpy( s, "/" );
   return ret;
 }