dnl Checks for libuna or required headers and functions
dnl
dnl Version: 20200711

dnl Function to detect if a specific libuna definition is available.
AC_DEFUN([AX_LIBUNA_CHECK_DEFINITION],
  [AC_CACHE_CHECK(
    [if `$1' is defined],
    [$2],
    [AC_LANG_PUSH(C)
    AC_LINK_IFELSE(
      [AC_LANG_PROGRAM(
        [[#include <libuna.h>]],
        [[int test = $1;

return( 0 ); ]] )],
      [$2=yes],
      [$2=no])
    AC_LANG_POP(C)])
  ])

dnl Function to detect if libuna is available
dnl ac_libuna_dummy is used to prevent AC_CHECK_LIB adding unnecessary -l<library> arguments
AC_DEFUN([AX_LIBUNA_CHECK_LIB],
  [AS_IF(
    [test "x$ac_cv_enable_shared_libs" = xno || test "x$ac_cv_with_libuna" = xno],
    [ac_cv_libuna=no],
    [ac_cv_libuna=check
    dnl Check if the directory provided as parameter exists
    AS_IF(
      [test "x$ac_cv_with_libuna" != x && test "x$ac_cv_with_libuna" != xauto-detect],
      [AS_IF(
        [test -d "$ac_cv_with_libuna"],
        [CFLAGS="$CFLAGS -I${ac_cv_with_libuna}/include"
        LDFLAGS="$LDFLAGS -L${ac_cv_with_libuna}/lib"],
        [AC_MSG_FAILURE(
          [no such directory: $ac_cv_with_libuna],
          [1])
        ])
      ],
      [dnl Check for a pkg-config file
      AS_IF(
        [test "x$cross_compiling" != "xyes" && test "x$PKGCONFIG" != "x"],
        [PKG_CHECK_MODULES(
          [libuna],
          [libuna >= 20200711],
          [ac_cv_libuna=yes],
          [ac_cv_libuna=check])
        ])
      AS_IF(
        [test "x$ac_cv_libuna" = xyes],
        [ac_cv_libuna_CPPFLAGS="$pkg_cv_libuna_CFLAGS"
        ac_cv_libuna_LIBADD="$pkg_cv_libuna_LIBS"])
      ])

    AS_IF(
      [test "x$ac_cv_libuna" = xcheck],
      [dnl Check for headers
      AC_CHECK_HEADERS([libuna.h])

      AS_IF(
        [test "x$ac_cv_header_libuna_h" = xno],
        [ac_cv_libuna=no],
        [dnl Check for the individual functions
        ac_cv_libuna=yes

        AC_CHECK_LIB(
          una,
          libuna_get_version,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])

        dnl Base16 stream functions
        AC_CHECK_LIB(
          una,
          libuna_base16_stream_size_to_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_base16_stream_copy_to_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_base16_stream_size_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_base16_stream_copy_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_base16_stream_with_index_copy_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])

        dnl Base32 stream functions
        AC_CHECK_LIB(
          una,
          libuna_base32_quintuplet_copy_from_base32_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_base32_quintuplet_copy_to_base32_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_base32_quintuplet_copy_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_base32_quintuplet_copy_to_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])

        AC_CHECK_LIB(
          una,
          libuna_base32_stream_size_to_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_base32_stream_copy_to_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_base32_stream_size_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_base32_stream_copy_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_base32_stream_with_index_copy_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])

        dnl Base64 stream functions
        AC_CHECK_LIB(
          una,
          libuna_base64_triplet_copy_from_base64_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_base64_triplet_copy_to_base64_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_base64_triplet_copy_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_base64_triplet_copy_to_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])

        AC_CHECK_LIB(
          una,
          libuna_base64_stream_size_to_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_base64_stream_copy_to_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_base64_stream_size_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_base64_stream_copy_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_base64_stream_with_index_copy_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])

        dnl Byte stream functions
        AC_CHECK_LIB(
          una,
          libuna_byte_stream_size_from_utf8,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_byte_stream_copy_from_utf8,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_byte_stream_size_from_utf16,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_byte_stream_copy_from_utf16,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_byte_stream_size_from_utf32,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_byte_stream_copy_from_utf32,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])

        dnl UTF-8 stream functions
        AC_CHECK_LIB(
          una,
          libuna_utf8_stream_size_from_utf8,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_stream_copy_from_utf8,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_stream_size_from_utf16,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_stream_copy_from_utf16,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_stream_size_from_utf32,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_stream_copy_from_utf32,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])

        dnl UTF-16 stream functions
        AC_CHECK_LIB(
          una,
          libuna_utf16_stream_size_from_utf8,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_stream_copy_from_utf8,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_stream_size_from_utf16,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_stream_copy_from_utf16,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_stream_size_from_utf32,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_stream_copy_from_utf32,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])

        dnl UTF-32 stream functions
        AC_CHECK_LIB(
          una,
          libuna_utf32_stream_size_from_utf8,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_stream_copy_from_utf8,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_stream_size_from_utf16,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_stream_copy_from_utf16,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_stream_size_from_utf32,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_stream_copy_from_utf32,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])

        dnl UTF-8 string functions
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_size_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_copy_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_with_index_copy_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_size_from_utf7_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_copy_from_utf7_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_with_index_copy_from_utf7_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_size_from_utf8_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_copy_from_utf8_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_with_index_copy_from_utf8_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_size_from_utf16_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_copy_from_utf16_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_with_index_copy_from_utf16_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_size_from_utf32_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_copy_from_utf32_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_with_index_copy_from_utf32_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_size_from_utf16,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_copy_from_utf16,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_with_index_copy_from_utf16,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_size_from_utf32,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_copy_from_utf32,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_with_index_copy_from_utf32,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_size_from_scsu_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_copy_from_scsu_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf8_string_with_index_copy_from_scsu_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])

        dnl UTF-16 string functions
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_size_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_copy_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_with_index_copy_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_size_from_utf7_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_copy_from_utf7_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_with_index_copy_from_utf7_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_size_from_utf8_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_copy_from_utf8_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_with_index_copy_from_utf8_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_size_from_utf16_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_copy_from_utf16_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_with_index_copy_from_utf16_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_size_from_utf32_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_copy_from_utf32_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_with_index_copy_from_utf32_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_size_from_utf8,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_copy_from_utf8,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_with_index_copy_from_utf8,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_size_from_utf32,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_copy_from_utf32,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_with_index_copy_from_utf32,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_size_from_scsu_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_copy_from_scsu_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf16_string_with_index_copy_from_scsu_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])

        dnl UTF-32 string functions
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_size_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_copy_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_with_index_copy_from_byte_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_size_from_utf7_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_copy_from_utf7_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_with_index_copy_from_utf7_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_size_from_utf8_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_copy_from_utf8_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_with_index_copy_from_utf8_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_size_from_utf16_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_copy_from_utf16_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_with_index_copy_from_utf16_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_size_from_utf32_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_copy_from_utf32_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_with_index_copy_from_utf32_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_size_from_utf8,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_copy_from_utf8,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          libuna_utf32_string_with_index_copy_from_utf8,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_size_from_utf16,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_copy_from_utf16,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_with_index_copy_from_utf16,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_size_from_scsu_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_copy_from_scsu_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])
        AC_CHECK_LIB(
          una,
          libuna_utf32_string_with_index_copy_from_scsu_stream,
          [ac_cv_libuna_dummy=yes],
          [ac_cv_libuna=no])

        dnl Check for definitions
        AX_LIBUNA_CHECK_DEFINITION(
          LIBUNA_COMPARE_LESS,
          [ac_cv_libuna_defines_compare_less])
        AS_IF(
          [test "x$ac_cv_libuna_defines_compare_less" != xyes],
          [ac_cv_libuna=no])

        AX_LIBUNA_CHECK_DEFINITION(
          LIBUNA_COMPARE_EQUAL,
          [ac_cv_libuna_defines_compare_equal])
        AS_IF(
          [test "x$ac_cv_libuna_defines_compare_less" != xyes],
          [ac_cv_libuna=no])

        AX_LIBUNA_CHECK_DEFINITION(
          LIBUNA_COMPARE_GREATER,
          [ac_cv_libuna_defines_compare_greater])
        AS_IF(
          [test "x$ac_cv_libuna_defines_compare_less" != xyes],
          [ac_cv_libuna=no])

        ac_cv_libuna_LIBADD="-luna"])
      ])
    AS_IF(
      [test "x$ac_cv_with_libuna" != x && test "x$ac_cv_with_libuna" != xauto-detect && test "x$ac_cv_libuna" != xyes],
      [AC_MSG_FAILURE(
        [unable to find supported libuna in directory: $ac_cv_with_libuna],
        [1])
      ])
    ])

  AS_IF(
    [test "x$ac_cv_libuna" = xyes],
    [AC_DEFINE(
      [HAVE_LIBUNA],
      [1],
      [Define to 1 if you have the `una' library (-luna).])
    ])

  AS_IF(
    [test "x$ac_cv_libuna" = xyes],
    [AC_SUBST(
      [HAVE_LIBUNA],
      [1]) ],
    [AC_SUBST(
      [HAVE_LIBUNA],
      [0])
    ])
  ])

dnl Function to detect if libuna dependencies are available
AC_DEFUN([AX_LIBUNA_CHECK_LOCAL],
  [dnl No additional checks.

  ac_cv_libuna_CPPFLAGS="-I../libuna";
  ac_cv_libuna_LIBADD="../libuna/libuna.la";

  ac_cv_libuna=local
  ])

dnl Function to detect how to enable libuna
AC_DEFUN([AX_LIBUNA_CHECK_ENABLE],
  [AX_COMMON_ARG_WITH(
    [libuna],
    [libuna],
    [search for libuna in includedir and libdir or in the specified DIR, or no if to use local version],
    [auto-detect],
    [DIR])

  dnl Check for a shared library version
  AX_LIBUNA_CHECK_LIB

  dnl Check if the dependencies for the local library version
  AS_IF(
    [test "x$ac_cv_libuna" != xyes],
    [AX_LIBUNA_CHECK_LOCAL

    AC_DEFINE(
      [HAVE_LOCAL_LIBUNA],
      [1],
      [Define to 1 if the local version of libuna is used.])
    AC_SUBST(
      [HAVE_LOCAL_LIBUNA],
      [1])
    ])

  AM_CONDITIONAL(
    [HAVE_LOCAL_LIBUNA],
    [test "x$ac_cv_libuna" = xlocal])
  AS_IF(
    [test "x$ac_cv_libuna_CPPFLAGS" != "x"],
    [AC_SUBST(
      [LIBUNA_CPPFLAGS],
      [$ac_cv_libuna_CPPFLAGS])
    ])
  AS_IF(
    [test "x$ac_cv_libuna_LIBADD" != "x"],
    [AC_SUBST(
      [LIBUNA_LIBADD],
      [$ac_cv_libuna_LIBADD])
    ])

  AS_IF(
    [test "x$ac_cv_libuna" = xyes],
    [AC_SUBST(
      [ax_libuna_pc_libs_private],
      [-luna])
    ])

  AS_IF(
    [test "x$ac_cv_libuna" = xyes],
    [AC_SUBST(
      [ax_libuna_spec_requires],
      [libuna])
    AC_SUBST(
      [ax_libuna_spec_build_requires],
      [libuna-devel])
    ])
  ])

