$ sed -n '20,24p' /tmp/autoconf-archive/m4/ax_gcc_x86_avx_xgetbv.m4
#   If the xgetbv instruction fails (because you are running a
#   cross-compiler, or because you are not using gcc, or because you are on
#   a processor that doesn't have this instruction),
#   ax_cv_gcc_x86_avx_xgetbv_OP is set to the string "unknown".
#
$ sed -n '75,77p' /tmp/autoconf-archive/m4/ax_gcc_x86_avx_xgetbv.m4
     [ax_cv_gcc_x86_avx_xgetbv_$1=`cat conftest_xgetbv`; rm -f conftest_xgetbv],
     [ax_cv_gcc_x86_avx_xgetbv_$1=unknown; rm -f conftest_xgetbv],
     [ax_cv_gcc_x86_avx_xgetbv_$1=unknown])])
$ sed -n '22,25p' /tmp/autoconf-archive/m4/ax_gcc_x86_cpuid.m4
#   If the cpuid instruction fails (because you are running a
#   cross-compiler, or because you are not using gcc, or because you are on
#   a processor that doesn't have this instruction), ax_cv_gcc_x86_cpuid_OP
#   is set to the string "unknown".
$ sed -n '85,87p' /tmp/autoconf-archive/m4/ax_gcc_x86_cpuid.m4
     [ax_cv_gcc_x86_cpuid_$1=`cat conftest_cpuid`; rm -f conftest_cpuid],
     [ax_cv_gcc_x86_cpuid_$1=unknown; rm -f conftest_cpuid],
     [ax_cv_gcc_x86_cpuid_$1=unknown])])
$ 

$ sed -n '21,25p' /tmp/autoconf-archive/m4/ax_prog_emacs.m4
#   If env var EMACS is set, try to use its value directly, but avoid
#   getting fooled by value 't' (set by older Emacsen for subprocesses). If
#   no joy from the environment, search for "emacs" via AC_CHECK_PROG. If
#   still no joy, display "Emacs not found; required!" and make configure
#   exit failurefully. Otherwise, set shell var EMACS and AC_SUBST it, too.
$