Output from running autoreconf:
  configure.ac:97: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:97: the top level
  configure.ac:109: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:109: the top level
  configure.ac:137: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:137: the top level
  configure.ac:156: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2601: _AC_COMPILE_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2617: AC_COMPILE_IFELSE is expanded from...
  configure.ac:156: the top level
  configure.ac:167: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:167: the top level
  configure.ac:223: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:223: the top level
  configure.ac:243: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:243: the top level
  configure.ac:260: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:260: the top level
  configure.ac:97: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:97: the top level
  configure.ac:109: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:109: the top level
  configure.ac:137: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:137: the top level
  configure.ac:156: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2601: _AC_COMPILE_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2617: AC_COMPILE_IFELSE is expanded from...
  configure.ac:156: the top level
  configure.ac:167: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:167: the top level
  configure.ac:223: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:223: the top level
  configure.ac:243: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:243: the top level
  configure.ac:260: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:260: the top level
  configure.ac:97: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:97: the top level
  configure.ac:109: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:109: the top level
  configure.ac:137: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:137: the top level
  configure.ac:156: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2601: _AC_COMPILE_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2617: AC_COMPILE_IFELSE is expanded from...
  configure.ac:156: the top level
  configure.ac:167: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:167: the top level
  configure.ac:223: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:223: the top level
  configure.ac:243: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:243: the top level
  configure.ac:260: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:260: the top level
  configure.ac:97: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:97: the top level
  configure.ac:109: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:109: the top level
  configure.ac:137: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:137: the top level
  configure.ac:156: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2601: _AC_COMPILE_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2617: AC_COMPILE_IFELSE is expanded from...
  configure.ac:156: the top level
  configure.ac:167: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:167: the top level
  configure.ac:223: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:223: the top level
  configure.ac:243: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:243: the top level
  configure.ac:260: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
  ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
  ../../lib/autoconf/general.m4:2672: _AC_LINK_IFELSE is expanded from...
  ../../lib/autoconf/general.m4:2689: AC_LINK_IFELSE is expanded from...
  configure.ac:260: the top level