dnl @synopsis ACX_CHECK_HEADER_IN_DIRS (HEADER, DIR-LIST, [
dnl			ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND[, MESSAGE]]])
dnl
dnl This macro looks for a header file in the include directories
dnl and in the sub-directories specified by DIR-LIST.
dnl
dnl This macro requires autoconf 2.50 or later.
dnl
dnl @version $Id: acx_include_dirs.m4,v 1.2 2005-09-15 19:52:50 jwe Exp $
dnl @author David Bateman <dbateman@free.fr>
dnl
AC_DEFUN([ACX_CHECK_HEADER_IN_DIRS], [
AC_PREREQ(2.50)
acx_include_ok=no
acx_include_dir=

# First check the header in the base directory
AC_CHECK_HEADER($1, [acx_include_ok=yes])

# Now check the other directories
if test x"$acx_include_ok" = xno; then
  for dir in $2; do
    AC_CHECK_HEADER(${dir}/$1, [acx_include_ok=yes; acx_include_dir=${dir}; break])
  done
fi

# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
if test x"$acx_include_ok" = xyes; then
  acx_header=HEADER_`echo $1 | sed -e 's/[^a-zA-Z0-9_]/_/g' \
    -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'`
  ifelse([$3],,AC_DEFINE(${acx_header},$acx_include_dir/$1,[$5]),[$3])
else
  $4
fi
])dnl ACX_CHECK_HEADER_IN_DIRS