diff -uNr tt/src/system.c tt.mod/src/system.c
--- src/system.c	2019-11-03 01:01:58.000000000 +0100
+++ src/system.c	2019-11-13 23:17:14.053972425 +0100
@@ -73,7 +73,7 @@
 		case 0:
 			sprintf(temp, "exec %s", arg2);
 			argv[2] = temp;
-			execv("/bin/sh", argv);
+			execv("@TERMUX_PREFIX@/bin/sh", argv);
 			break;
 
 		default: