autogen.sh spews warnings
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A recent version of autoconf (at least 2.68 does this; the attached output may be from a different version) spews many warnings of the form:
configure.in:300: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2662: _AC_LINK_IFELSE is expanded from...
../../lib/autoconf/general.m4:2679: AC_LINK_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
acinclude.m4:82: TOR_SEARCH_LIBRARY is expanded from...
configure.in:300: the top levelSee attachment for the full message dump.