Further enhance the check for needed tools:
- update the tool_pattern to use ' || ' as a pattern separator
- which allows using | in regexp
- add checks for cut and xargs
- manually check for grep and sed because they are needed when checking for tools
- print why a test failed, with each tested tool and regexp
- move tools checks before options parsing
- apply conttibutions before computing the version string
- inform user to run make && make install

/trunk/configure | 173 111 62 0 ++++++++++++++++++++++++++++++++++++++++----------------------
1 file changed, 111 insertions(+), 62 deletions(-)

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 ()

 {