Please observe that the following code from 3.1.2 "The Autoconf Language" is obsolete and should be updated:
AC_COMPILE_IFELSE([[char b[10];]], [], [AC_MSG_ERROR([you lose])]) Running this snippet through autoconf produces the warning: no AC_LANG_SOURCE call detected in body It seems the following syntax is required instead: AC_COMPILE_IFELSE([AC_LANG_SOURCE([[char b[10];]])], [], [AC_MSG_ERROR([you lose])]) Please fix, Chris