diff -r d1a8c2ae7946 -r 22239d19ad65 config/libc/uClibc.in.2
--- a/config/libc/uClibc.in.2	Tue May 31 16:27:39 2011 +0200
+++ b/config/libc/uClibc.in.2	Sat Jan 04 16:19:18 2014 +0100
@@ -65,3 +65,18 @@
       Say y if you want uClibc to support WCHAR.
 
       Maybe this is needed, if you're building a C++-Compiler
+
+config LIBC_UCLIBC_FENV
+    bool
+    prompt "Add support for fenv.h"
+    default y if ARCH_x86
+    help
+      fenv.h provides functions to control the floating point environment,
+      such as rounding mode, exceptions...
+
+      For some architectures, fenv.h is incomplete, so is not installed
+      by default. x86 is known to have a rather complete fenv.h, so it is
+      installed by default only for x86.
+
+      If you need fenv.h on other architectures, say 'y' here, but you may
+      encounter some issues.