autoconf in system without cxx

[Rogelio Serrano]

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Configuration of gnu packages fails in system without c++. This
happens when compiling gettext, iconv and libtool.
Configuration fails after the test for cxx cpp. I have tried
different switches and other tricks like commenting out
portions of the configure scripts. I tried rebuilding  the
configure script after modifying configure.ac but still it does
not work. Configure just bails out with the same error message
all the time.

configure: error: c++ preprocessor "/lib/cpp" fails sanity check

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