diff -u -r ../ruby-2.6.1/process.c ./process.c
--- ../ruby-2.6.1/process.c	2018-12-22 10:23:06.000000000 +0000
+++ ./process.c	2019-02-16 09:27:04.713434722 +0000
@@ -1569,9 +1569,9 @@
     *argv = (char *)prog;
     *--argv = (char *)"sh";
     if (envp)
-        execve("/bin/sh", argv, envp); /* async-signal-safe */
+        execve("@TERMUX_PREFIX@/bin/sh", argv, envp); /* async-signal-safe */
     else
-        execv("/bin/sh", argv); /* async-signal-safe (since SUSv4) */
+        execv("@TERMUX_PREFIX@/bin/sh", argv); /* async-signal-safe (since SUSv4) */
 }
 
 #else
@@ -1639,9 +1639,9 @@
     }
 #else
     if (envp_str)
-        execle("/bin/sh", "sh", "-c", str, (char *)NULL, RB_IMEMO_TMPBUF_PTR(envp_str)); /* async-signal-safe */
+        execle("@TERMUX_PREFIX@/bin/sh", "sh", "-c", str, (char *)NULL, RB_IMEMO_TMPBUF_PTR(envp_str)); /* async-signal-safe */
     else
-        execl("/bin/sh", "sh", "-c", str, (char *)NULL); /* async-signal-safe (since SUSv4) */
+        execl("@TERMUX_PREFIX@/bin/sh", "sh", "-c", str, (char *)NULL); /* async-signal-safe (since SUSv4) */
 #endif	/* _WIN32 */
     return errno;
 }
@@ -1744,7 +1744,7 @@
     if (status == -1 && errno == ENOEXEC) {
 	*argv = (char *)prog;
 	*--argv = (char *)"sh";
-	status = spawnv(P_NOWAIT, "/bin/sh", (const char **)argv);
+	status = spawnv(P_NOWAIT, "@TERMUX_PREFIX@/bin/sh", (const char **)argv);
 	after_exec();
 	if (status == -1) errno = ENOEXEC;
     }
@@ -1782,7 +1782,7 @@
 
     char *shell = dln_find_exe_r("sh", 0, fbuf, sizeof(fbuf));
     before_exec();
-    status = spawnl(P_NOWAIT, (shell ? shell : "/bin/sh"), "sh", "-c", str, (char*)NULL);
+    status = spawnl(P_NOWAIT, (shell ? shell : "@TERMUX_PREFIX@/bin/sh"), "sh", "-c", str, (char*)NULL);
     after_exec();
     return status;
 }
