--- ngspice-37/src/frontend/com_shell.c	2022-05-17 18:00:52.000000000 +0800
+++ ngspice-37.mod/src/frontend/com_shell.c	2022-06-16 22:56:25.591998228 +0800
@@ -14,7 +14,7 @@
 #ifdef _WIN32
 #define SHELL "cmd /k"
 #else
-#define SHELL "/bin/sh"
+#define SHELL "@TERMUX_PREFIX@/bin/sh"
 #endif
 
 /* Fork a shell. */
@@ -42,7 +42,7 @@
             _exit(99);
         } else {
             char * const com = wl_flatten(wl);
-            execl("/bin/sh", "sh", "-c", com, 0);
+            execl("@TERMUX_PREFIX@/bin/sh", "sh", "-c", com, 0);
             txfree(com);
         }
     } else {