Original patch from gentoo: gentoo/src/patchsets/gcc/4.3.0/uclibc/90_all_303-c99-complex-ugly-hack.patch

 diff -durN gcc-4.3.0.orig/libstdc++-v3/configure gcc-4.3.0/libstdc++-v3/configure

 --- gcc-4.3.0.orig/libstdc++-v3/configure	2008-06-10 14:45:39.000000000 +0200

 +++ gcc-4.3.0/libstdc++-v3/configure	2008-06-10 14:45:54.000000000 +0200

 @@ -39006,6 +39006,9 @@

  cat >>conftest.$ac_ext <<_ACEOF

  /* end confdefs.h.  */

  #include <complex.h>

 +#ifdef __UCLIBC__

 +#error ugly hack to make sure configure test fails here for cross until uClibc supports the complex funcs

 +#endif

  int

  main ()

  {