Without this change, I get the following errors when trying to run autoconf on Ubuntu 11.10:
configure.ac:XX: 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...
configure.ac:XX: the top level
Without this change, I get the following errors when trying to run autoconf on Ubuntu 11.10:
configure.ac:XX: 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... configure.ac:XX: the top level
See http://www.flameeyes.eu/autotools-mythbuster/forwardporting/autoconf.html and http://www.mail-archive.com/bug-autoconf@gnu.org/msg03052.html for details.