--- ./tools/lvmcmdline.c
+++ ./tools/lvmcmdline.c
@@ -1252,7 +1252,7 @@
 	int err = is_valid_fd(STDERR_FILENO);
 
 	if (!is_valid_fd(STDIN_FILENO) &&
-	    !(stdin = fopen(_PATH_DEVNULL, "r"))) {
+	    !freopen(_PATH_DEVNULL, "r", stdin)) {
 		if (err)
 			perror("stdin stream open");
 		else
@@ -1262,7 +1262,7 @@
 	}
 
 	if (!is_valid_fd(STDOUT_FILENO) &&
-	    !(stdout = fopen(_PATH_DEVNULL, "w"))) {
+	    !freopen(_PATH_DEVNULL, "w", stdout)) {
 		if (err)
 			perror("stdout stream open");
 		/* else no stdout */
@@ -1270,7 +1270,7 @@
 	}
 
 	if (!is_valid_fd(STDERR_FILENO) &&
-	    !(stderr = fopen(_PATH_DEVNULL, "w"))) {
+	    !freopen(_PATH_DEVNULL, "w", stderr)) {
 		printf("stderr stream open: %s\n",
 		       strerror(errno));
 		return 0;
--- ./lib/commands/toolcontext.c.orig
+++ ./lib/commands/toolcontext.c
@@ -1860,7 +1860,7 @@
	/* FIXME Make this configurable? */
	reset_lvm_errno(1);
 
-#ifndef VALGRIND_POOL
+#if !defined(VALGRIND_POOL) && defined(__GLIBC__)
	/* Set in/out stream buffering before glibc */
	if (set_buffering
 #ifdef SYS_gettid
@@ -2254,7 +2254,7 @@
	if (cmd->libmem)
		dm_pool_destroy(cmd->libmem);
 
-#ifndef VALGRIND_POOL
+#if !defined(VALGRIND_POOL) && defined(__GLIBC__)
	if (cmd->linebuffer) {
	/* Reset stream buffering to defaults */
	   if (is_valid_fd(STDIN_FILENO) &&
