Index: gcc-4.2.3/libstdc++-v3/configure
===================================================================
--- gcc-4.2.3.orig/libstdc++-v3/configure	2008-05-21 13:45:44.017287734 +0200
+++ gcc-4.2.3/libstdc++-v3/configure	2008-05-21 13:45:49.305288105 +0200
@@ -7514,6 +7514,9 @@
 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 ()
 {