Patch against OS X 10.6 math.h fixing compilation of C++11 programs with libc++.

gistfile1.diff

--- /usr/include/architecture/i386/math.h	2009-10-02 02:12:05.000000000 -0400
+++ /usr/local/include/math.h	2012-05-17 15:32:14.000000000 -0400
@@ -384,7 +384,7 @@
 extern long int lround ( double );
 extern long int lroundf ( float );
 
-#if ( defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L ) || ! defined( __STRICT_ANSI__ )  || ! defined( __GNUC__ )
+#if !(__DARWIN_NO_LONG_LONG)
 
     /* long long is not part of C90. Make sure you are passing -std=c99 or -std=gnu99 or better if you need this. */
     extern long long int llrint ( double );
@@ -393,7 +393,7 @@
     extern long long int llround ( double );
     extern long long int llroundf ( float );
 
-#endif /* #if ( defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L ) || ! defined( __STRICT_ANSI__ )  || ! defined( __GNUC__ ) */
+#endif /* !(__DARWIN_NO_LONG_LONG) */
 
 extern double trunc ( double );
 extern float truncf ( float );
@@ -479,11 +479,11 @@
 extern long double roundl(long double);
 extern long int lroundl(long double);
 
-#if ( defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L ) || ! defined( __STRICT_ANSI__ )  || ! defined( __GNUC__ )
+#if !(__DARWIN_NO_LONG_LONG)
     /* long long is not part of C90. Make sure you are passing -std=c99 or -std=gnu99 or better if you need this. */
     extern long long int llrintl(long double);
     extern long long int llroundl(long double);
-#endif /* #if ( defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L ) || ! defined( __STRICT_ANSI__ )  || ! defined( __GNUC__ ) */
+#endif /* !(__DARWIN_NO_LONG_LONG) */
 
 extern long double truncl(long double);
 extern long double fmodl(long double, long double);

Fixes bug described here as provided by 10.7's libm

Can be patched into /usr/local/include without disturbing the system math.h using something like:

patch -p0 -o math.h < math.h.patch
sudo install math.h /usr/local/include

Note: This patch only applies to the x86/x86_64 math header. The math.h at /usr/include is a wrapper which conditionally includes Arm and PPC versions as well. If you need these, don't add this to /usr/local without adding an analogous wrapper.