diff -uNr i3-4.15/i3-nagbar/main.c i3-4.15.mod/i3-nagbar/main.c
--- i3-4.15/i3-nagbar/main.c	2018-03-10 19:29:14.000000000 +0200
+++ i3-4.15.mod/i3-nagbar/main.c	2018-06-21 19:48:29.560253964 +0300
@@ -172,7 +172,7 @@
         warn("Could not fdopen() temporary script to store the nagbar command");
         return;
     }
-    fprintf(script, "#!/bin/sh\nrm %s\n%s", script_path, button->action);
+    fprintf(script, "#!@TERMUX_PREFIX@/bin/sh\nrm %s\n%s", script_path, button->action);
     /* Also closes fd */
     fclose(script);
 
@@ -343,8 +343,8 @@
         unlink(argv[0]);
         cmd = sstrdup(argv[0]);
         *(cmd + argv0_len - strlen(".nagbar_cmd")) = '\0';
-        execl("/bin/sh", "/bin/sh", cmd, NULL);
-        err(EXIT_FAILURE, "execv(/bin/sh, /bin/sh, %s)", cmd);
+        execl("@TERMUX_PREFIX@/bin/sh", "@TERMUX_PREFIX@/bin/sh", cmd, NULL);
+        err(EXIT_FAILURE, "execv(@TERMUX_PREFIX@/bin/sh, @TERMUX_PREFIX@/bin/sh, %s)", cmd);
     }
 
     argv0 = argv[0];