diff --git a/include/platform.h b/include/platform.h
index 7c88d1ba6..1fa2ece2b 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -7,6 +7,13 @@
 #ifndef	BB_PLATFORM_H
 #define BB_PLATFORM_H 1
 
+/* Assume all these functions exist by default.  Platforms where it is not
+ * true will #undef them below.
+ */
+#define HAVE_FDPRINTF 1
+#define HAVE_STRCHRNUL 1
+#define HAVE_VASPRINTF 1
+
 /* Convenience macros to test the version of gcc. */
 #undef __GNUC_PREREQ
 #if defined __GNUC__ && defined __GNUC_MINOR__
@@ -126,7 +133,6 @@
 # define __BIG_ENDIAN__ (BYTE_ORDER == BIG_ENDIAN)
 # define __BYTE_ORDER BYTE_ORDER
 #elif defined __FreeBSD__
-char *strchrnul(const char *s, int c);
 # include <sys/resource.h>	/* rlimit */
 # include <machine/endian.h>
 # define bswap_64 __bswap64
@@ -148,7 +154,7 @@ char *strchrnul(const char *s, int c);
 # define BB_BIG_ENDIAN 0
 # define BB_LITTLE_ENDIAN 1
 #else
-# error "Can't determine endiannes"
+# error "Can't determine endianness"
 #endif
 
 /* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */
@@ -293,24 +299,6 @@ typedef unsigned smalluint;
 # define USE_FOR_MMU(...) __VA_ARGS__
 #endif
 
-/* Platforms that haven't got dprintf need to implement fdprintf() in
- * libbb.  This would require a platform.c.  It's not going to be cleaned
- * out of the tree, so stop saying it should be. */
-#if !defined(__dietlibc__)
-/* Needed for: glibc */
-/* Not needed for: dietlibc */
-/* Others: ?? (add as needed) */
-# define fdprintf dprintf
-#endif
-
-#if defined(__dietlibc__)
-static ALWAYS_INLINE char* strchrnul(const char *s, char c)
-{
-	while (*s && *s != c) ++s;
-	return (char*)s;
-}
-#endif
-
 /* Don't use lchown with glibc older than 2.1.x */
 #if defined(__GLIBC__) && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1
 # define lchown chown
@@ -342,5 +330,39 @@ static ALWAYS_INLINE char* strchrnul(const char *s, char c)
 
 #endif
 
+#if defined(__GLIBC__)
+# define fdprintf dprintf
+#endif
+
+#if defined(__dietlibc__)
+#undef HAVE_STRCHRNUL
+#endif
+
+#if defined(__WATCOMC__)
+#undef HAVE_FDPRINTF
+#undef HAVE_STRCHRNUL
+#undef HAVE_VASPRINTF
+#endif
+
+#if defined(__FreeBSD__)
+#undef HAVE_STRCHRNUL
+#endif
+
+/*
+ * Now, define prototypes for all the functions defined in platform.c
+ * These must come after all the HAVE_* macros are defined (or not)
+ */
+
+#ifndef HAVE_STRCHRNUL
+extern char *strchrnul(const char *s, int c) FAST_FUNC;
+#endif
+
+#ifndef HAVE_VASPRINTF
+extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC;
+#endif
+
+#ifndef HAVE_FDPRINTF
+extern int fdprintf(int fd, const char *format, ...);
+#endif
 
 #endif
diff --git a/libbb/Kbuild b/libbb/Kbuild
index 8c7a189b4..c3c02b33e 100644
--- a/libbb/Kbuild
+++ b/libbb/Kbuild
@@ -71,6 +71,7 @@ lib-y += perror_msg_and_die.o
 lib-y += perror_nomsg.o
 lib-y += perror_nomsg_and_die.o
 lib-y += pidfile.o
+lib-y += platform.o
 lib-y += printable.o
 lib-y += print_flags.o
 lib-y += process_escape_sequence.o
diff --git a/libbb/platform.c b/libbb/platform.c
new file mode 100644
index 000000000..470185a68
--- /dev/null
+++ b/libbb/platform.c
@@ -0,0 +1,57 @@
+/*
+ * Replacements for common but usually nonstandard functions that aren't
+ * supplied by all platforms.
+ *
+ * Copyright (C) 2009 by Dan Fandrich <dan@coneharvesters.com>, et. al.
+ *
+ * Licensed under the GPL version 2, see the file LICENSE in this tarball.
+ */
+
+#include "libbb.h"
+
+#ifndef HAVE_STRCHRNUL
+char * FAST_FUNC strchrnul(const char *s, int c)
+{
+	while (*s && *s != c) ++s;
+	return (char*)s;
+}
+#endif
+
+#ifndef HAVE_VASPRINTF
+int FAST_FUNC vasprintf(char **string_ptr, const char *format, va_list p)
+{
+	int r;
+	va_list p2;
+
+	va_copy(p2, p);
+	r = vsnprintf(NULL, 0, format, p);
+	va_end(p);
+	*string_ptr = xmalloc(r+1);
+	if (!*string_ptr)
+		r = -1;
+	else
+		r = vsnprintf(*string_ptr, r+1, format, p2);
+	va_end(p2);
+
+	return r;
+}
+#endif
+
+#ifndef HAVE_FDPRINTF
+int fdprintf(int fd, const char *format, ...)
+{
+	va_list p;
+	int r;
+	char *string_ptr;
+
+	va_start(p, format);
+	r = vasprintf(&string_ptr, format, p);
+	va_end(p);
+	if (r >= 0) {
+		r = full_write(fd, string_ptr, r);
+		free(string_ptr);
+	}
+	return r;
+}
+#endif
+
diff --git a/libbb/xfuncs_printf.c b/libbb/xfuncs_printf.c
index aaf9989a0..345c84219 100644
--- a/libbb/xfuncs_printf.c
+++ b/libbb/xfuncs_printf.c
@@ -283,60 +283,15 @@ char* FAST_FUNC xasprintf(const char *format, ...)
 	int r;
 	char *string_ptr;
 
-#if 1
-	// GNU extension
 	va_start(p, format);
 	r = vasprintf(&string_ptr, format, p);
 	va_end(p);
-#else
-	// Bloat for systems that haven't got the GNU extension.
-	va_start(p, format);
-	r = vsnprintf(NULL, 0, format, p);
-	va_end(p);
-	string_ptr = xmalloc(r+1);
-	va_start(p, format);
-	r = vsnprintf(string_ptr, r+1, format, p);
-	va_end(p);
-#endif
 
 	if (r < 0)
 		bb_error_msg_and_die(bb_msg_memory_exhausted);
 	return string_ptr;
 }
 
-#if 0 /* If we will ever meet a libc which hasn't [f]dprintf... */
-int FAST_FUNC fdprintf(int fd, const char *format, ...)
-{
-	va_list p;
-	int r;
-	char *string_ptr;
-
-#if 1
-	// GNU extension
-	va_start(p, format);
-	r = vasprintf(&string_ptr, format, p);
-	va_end(p);
-#else
-	// Bloat for systems that haven't got the GNU extension.
-	va_start(p, format);
-	r = vsnprintf(NULL, 0, format, p) + 1;
-	va_end(p);
-	string_ptr = malloc(r);
-	if (string_ptr) {
-		va_start(p, format);
-		r = vsnprintf(string_ptr, r, format, p);
-		va_end(p);
-	}
-#endif
-
-	if (r >= 0) {
-		full_write(fd, string_ptr, r);
-		free(string_ptr);
-	}
-	return r;
-}
-#endif
-
 void FAST_FUNC xsetenv(const char *key, const char *value)
 {
 	if (setenv(key, value, 1))