dnl this is used by the macro blow to general a proper config.h.in entry
m4_define([LYX_AH_CHECK_DECL],
[AH_TEMPLATE(AS_TR_CPP(HAVE_DECL_$1),
  [Define if you have the prototype for function `$1'])])

dnl Check things are declared in headers to avoid errors or warnings.
dnl Called like LYX_CHECK_DECL(function, header1 header2...)
dnl Defines HAVE_DECL_{FUNCTION}
AC_DEFUN([LYX_CHECK_DECL],
[LYX_AH_CHECK_DECL($1)
for ac_header in $2 
do
  AC_MSG_CHECKING([if $1 is declared by header $ac_header])
  AC_EGREP_HEADER($1, $ac_header, 
      [AC_MSG_RESULT(yes)
       AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_DECL_$1))
       break],
      [AC_MSG_RESULT(no)])
done])


dnl Set VAR to the canonically resolved absolute equivalent of PATHNAME,
dnl (which may be a relative path, and need not refer to any existing 
dnl entity).

dnl On Win32-MSYS build hosts, the returned path is resolved to its true
dnl native Win32 path name, (but with slashes, not backslashes).

dnl On any other system, it is simply the result which would be obtained
dnl if PATHNAME represented an existing directory, and the pwd command was
dnl executed in that directory.
AC_DEFUN([MSYS_AC_CANONICAL_PATH],
[ac_dir="$2"
 ( exec 2>/dev/null; cd / && pwd -W ) | grep ':' >/dev/null &&
    ac_pwd_w="pwd -W" || ac_pwd_w=pwd
 until ac_val=`exec 2>/dev/null; cd "$ac_dir" && $ac_pwd_w`
 do
   ac_dir=`AS_DIRNAME(["$ac_dir"])`
 done
 ac_dir=`echo "$ac_dir" | sed 's?^[[./]]*??'`
 ac_val=`echo "$ac_val" | sed 's?/*$[]??'`
 $1=`echo "$2" | sed "s?^[[./]]*$ac_dir/*?$ac_val/?"'
   s?/*$[]??'`
])