diff -uNr fltk-1.3.4/src/Fl_File_Browser.cxx fltk-1.3.4.mod/src/Fl_File_Browser.cxx
--- fltk-1.3.4/src/Fl_File_Browser.cxx	2016-10-19 08:55:03.000000000 +0300
+++ fltk-1.3.4.mod/src/Fl_File_Browser.cxx	2017-12-10 15:19:04.555072795 +0200
@@ -624,13 +624,16 @@
     // Open the file that contains a list of mounted filesystems...
     //
 
-    mtab = fl_fopen("/etc/mnttab", "r");	// Fairly standard
+    mtab = fl_fopen("/data/data/com.termux/files/usr/etc/mnttab", "r");	// Fairly standard
     if (mtab == NULL)
-      mtab = fl_fopen("/etc/mtab", "r");	// More standard
+      mtab = fl_fopen("/data/data/com.termux/files/usr/etc/mtab", "r");	// More standard
     if (mtab == NULL)
-      mtab = fl_fopen("/etc/fstab", "r");	// Otherwise fallback to full list
+      mtab = fl_fopen("/data/data/com.termux/files/usr/etc/fstab", "r");	// Otherwise fallback to full list
     if (mtab == NULL)
-      mtab = fl_fopen("/etc/vfstab", "r");	// Alternate full list file
+      mtab = fl_fopen("/data/data/com.termux/files/usr/etc/vfstab", "r");	// Alternate full list file
+
+    if (mtab == NULL)
+      mtab = fl_fopen("/proc/mounts", "r"); // Try to use /proc/mounts
 
     if (mtab != NULL)
     {