$ autoreconf -fisv -I.
autoreconf-default: Entering directory `.'
autoreconf-default: configure.ac: not using Gettext
autoreconf-default: running: aclocal --force 
/usr/share/aclocal/libmikmod.m4:11: warning: underquoted definition of
AM_PATH_LIBMIKMOD
  run info '(automake)Extending aclocal'
  or see http://sources.redhat.com/automake/automake.html#Extending-aclocal
autoreconf-default: configure.ac: tracing
autoreconf-default: running: libtoolize --force
/usr/share/aclocal/libmikmod.m4:11: warning: underquoted definition of
AM_PATH_LIBMIKMOD
  run info '(automake)Extending aclocal'
  or see http://sources.redhat.com/automake/automake.html#Extending-aclocal
autoreconf-default: running: /usr/bin/autoconf-2.5 --include=. --force
configure.ac:177: error: possibly undefined macro:
AC_caolan_FUNC_WHICH_GETHOSTBYNAME_R
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
autoreconf-default: /usr/bin/autoconf-2.5 failed with exit status: 1
[1]    28598 exit 1     autoreconf -fisv -I.

$ grep -rl AC_caolan_FUNC_WHICH_GETHOSTBYNAME_R .
./ac_gethostbyname_r.m4
./configure
./configure.ac
./autom4te.cache/output.0
./autom4te.cache/output.1

$ cat autogen.sh 
#!/bin/sh
set -e
set -x
aclocal -I .
autoheader
libtoolize --force --automake --copy
automake --gnu --include-deps --copy --add-missing
autoconf

При этом autogen.sh отрабатывает.