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AC_INIT AC_CHECK_HEADERS(foo.h,, AC_MSG_ERROR(cannot find foo.h, bailing out)) AC_OUTPUT
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$ autoconf-2.13; ./configure --silent creating cache ./config.cache configure: error: cannot find foo.h $
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$ autoconf-2.50; ./configure --silent configure: error: cannot find foo.h ./configure: exit: bad non-numeric arg `bailing' ./configure: exit: bad non-numeric arg `bailing' $
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AC_DEFUN
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$ cat configure.in AC_DEFUN([AC_PROG_INSTALL], [# My own much better version ]) AC_INIT AC_PROG_INSTALL AC_OUTPUT $ autoconf-2.13 autoconf: Undefined macros: ***BUG in Autoconf--please report*** AC_FD_MSG ***BUG in Autoconf--please report*** AC_EPI configure.in:1:AC_DEFUN([AC_PROG_INSTALL], configure.in:5:AC_PROG_INSTALL $ autoconf-2.50 $