diff -uNr fltk-1.3.4/src/print_panel.cxx fltk-1.3.4.mod/src/print_panel.cxx
--- fltk-1.3.4/src/print_panel.cxx	2016-03-09 18:08:39.000000000 +0200
+++ fltk-1.3.4.mod/src/print_panel.cxx	2017-12-10 15:35:28.436230747 +0200
@@ -533,7 +533,7 @@
 
   defname[0] = '\0';
 // get names of all printers and of default one
-  if ((lpstat = popen("LC_MESSAGES=C LANG=C /bin/sh -c '(lpstat -p -d ) 2>&-'", "r")) != NULL) { // try first with SystemV printing system
+  if ((lpstat = popen("LC_MESSAGES=C LANG=C /data/data/com.termux/files/usr/bin/sh -c '(lpstat -p -d ) 2>&-'", "r")) != NULL) { // try first with SystemV printing system
     while (fgets(line, sizeof(line), lpstat)) {
       if (!strncmp(line, "printer ", 8) &&
           sscanf(line + 8, "%s", name) == 1) {
@@ -550,7 +550,7 @@
     pclose(lpstat);
   }
   
-  if (print_choice->size() == 2 && (lpstat = fopen("/etc/printcap", "r"))) { // try next with BSD printing system
+  if (print_choice->size() == 2 && (lpstat = fopen("/data/data/com.termux/files/usr/etc/printcap", "r"))) { // try next with BSD printing system
     while (fgets(line, sizeof(line),lpstat)) { // get names of all known printers
       if (*line == '#' || (p = strchr(line, '|')) == NULL) continue;
       *p = 0;
@@ -593,7 +593,7 @@
   status[0] = 0;
   if (print_choice->value()) {
     strcpy(status, "printer status unavailable");
-    snprintf(command, sizeof(command), "/bin/sh -c \"(lpstat -p '%s' ) 2>&-\" ", printer); // try first with SystemV printing system
+    snprintf(command, sizeof(command), "/data/data/com.termux/files/usr/bin/sh -c \"(lpstat -p '%s' ) 2>&-\" ", printer); // try first with SystemV printing system
     if ((lpstat = popen(command, "r")) !=  NULL) {
       if (fgets(status, sizeof(status), lpstat) == 0) { // if no reply
         pclose(lpstat);