Major Description
The builds gives warnings like this on Fedora Core 15, which has autoconf v2.68:
configure.ac:1120: 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.m4:2591: _AC_COMPILE_IFELSE is expanded from... ../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from... build/common.m4:174: TS_TRY_COMPILE_NO_WARNING is expanded from... ../../lib/autoconf/lang.m4:225: AC_LANG_SOURCE is expanded from... build/network.m4:28: TS_CHECK_GETHOSTBYNAME_R_STYLE is expanded from... configure.ac:1120: the top level configure.ac:1120: 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.m4:2591: _AC_COMPILE_IFELSE is expanded from... ../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from... build/common.m4:174: TS_TRY_COMPILE_NO_WARNING is expanded from... ../../lib/autoconf/lang.m4:225: AC_LANG_SOURCE is expanded from... build/network.m4:28: TS_CHECK_GETHOSTBYNAME_R_STYLE is expanded from... configure.ac:1120: the top level configure.ac:1120: 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.m4:2591: _AC_COMPILE_IFELSE is expanded from... ../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from... build/common.m4:174: TS_TRY_COMPILE_NO_WARNING is expanded from... ../../lib/autoconf/lang.m4:225: AC_LANG_SOURCE is expanded from... build/network.m4:28: TS_CHECK_GETHOSTBYNAME_R_STYLE is expanded from... configure.ac:1120: the top level