diff -uNr ./usr.old/include/stdio.h ./usr/include/stdio.h
--- ./usr.old/include/stdio.h	2019-05-22 12:49:28.000000000 +0300
+++ ./usr/include/stdio.h	2019-12-13 21:50:02.765565736 +0200
@@ -44,11 +44,12 @@
 #include <stdarg.h>
 #include <stddef.h>
 
+#include <string.h>            /* For strcpy(3) used by ctermid() */
+#include <asm/fcntl.h>         /* For O_RDWR and other O_* constants */
+
 #include <bits/seek_constants.h>
 
-#if __ANDROID_API__ < __ANDROID_API_N__
 #include <bits/struct_file.h>
-#endif
 
 __BEGIN_DECLS
 
@@ -165,7 +166,7 @@
     __printflike(2, 0) __warnattr_strict("vsprintf is often misused; please use vsnprintf");
 char* tmpnam(char* __s)
     __warnattr("tempnam is unsafe, use mkstemp or tmpfile instead");
-#define P_tmpdir "/tmp/" /* deprecated */
+#define P_tmpdir "@TERMUX_PREFIX@/tmp/" /* deprecated */
 char* tempnam(const char* __dir, const char* __prefix)
     __warnattr("tempnam is unsafe, use mkstemp or tmpfile instead");
 
@@ -289,8 +290,6 @@
 FILE* freopen64(const char* __path, const char* __mode, FILE* __fp) __INTRODUCED_IN(24);
 #endif /* __ANDROID_API__ >= 24 */
 
-FILE* tmpfile(void);
-
 #if __ANDROID_API__ >= 24
 FILE* tmpfile64(void) __INTRODUCED_IN(24);
 #endif /* __ANDROID_API__ >= 24 */
@@ -304,10 +303,15 @@
 
 #define L_ctermid 1024 /* size for ctermid() */
 
-#if __ANDROID_API__ >= 26
-char* ctermid(char* __buf) __INTRODUCED_IN(26);
-#endif /* __ANDROID_API__ >= 26 */
+/* Needed by gnulibs freading(). */
+#define __sferror(p)    (((p)->_flags & __SERR) != 0)
 
+/* Used by perl, fish, and others. */
+static __inline__ char* ctermid(char* s) {
+	if (s == 0) return (char*) "/dev/tty";
+	strcpy(s, "/dev/tty");
+	return s;
+}
 
 FILE* fdopen(int __fd, const char* __mode);
 int fileno(FILE* __fp);
@@ -376,6 +380,30 @@
 #include <bits/fortify/stdio.h>
 #endif
 
+int open(const char*, int, ...);
+extern pid_t getpid();
+extern int unlink(const char*);
+void free(void* p);
+uint32_t arc4random(void);
+static __inline__ FILE* tmpfile() {
+	int p = getpid();
+	char* path;
+	int i;
+	for (i = 0; i < 100; i++) {
+		unsigned int r = arc4random();
+		if (asprintf(&path, "@TERMUX_PREFIX@/tmp/tmpfile.%d-%u", p, r) == -1) return NULL;
+		int fd = open(path, O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE, 0600);
+		if (fd >= 0) {
+			FILE* result = fdopen(fd, "w+");
+			unlink(path);
+			free(path);
+			return result;
+		}
+		free(path);
+	}
+	return NULL;
+}
+
 __END_DECLS
 
 #endif