configure.ac

#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.

AC_PREREQ([2.60])
LT_PREREQ([2.4])
AC_INIT([sixel], [1.8.5], [saitoha@me.com])
LS_LT_CURRENT=1
LS_LT_REVISION=6
LS_LT_AGE=0
AC_SUBST([LS_LTVERSION], [$LS_LT_CURRENT:$LS_LT_REVISION:$LS_LT_AGE])
AC_SUBST([PACKAGE_DESCRIPTION],
         ["A lightweight, fast implementation of DEC SIXEL graphics codec"])

AC_CANONICAL_HOST

AM_INIT_AUTOMAKE([foreign])
LT_INIT
AC_CONFIG_SRCDIR([src/fromsixel.c])
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_MACRO_DIR([m4])

AX_GCC_VAR_ATTRIBUTE([deprecated])
if test x$ax_cv_have_func_attribute_deprecated != x; then
    AC_SUBST(attr_var_deprecated, [__attribute__\(\(deprecated\)\)])
fi

AX_GCC_FUNC_ATTRIBUTE([deprecated])
if test x$ax_cv_have_func_attribute_deprecated != x; then
    AC_SUBST(attr_func_deprecated, [__attribute__\(\(deprecated\)\)])
fi

AX_GCC_BUILTIN([__builtin_unreachable])

CFLAGS_BACKUP=$CFLAGS
CFLAGS="$CFLAGS -Werror"
AC_TRY_COMPILE(
  [
    #pragma GCC diagnostic push
    #pragma GCC diagnostic pop
    #pragma GCC diagnostic ignored "-Wtypedef-redefinition"
  ],
  [
    typedef int foo;
    typedef int foo;
  ],
  [AC_DEFINE(HAVE_DIAGNOSTIC_TYPEDEF_REDEFINITION,
             1,
             [define 1 if GCC supports -Wtypedef-redefinition])])
CFLAGS=$CFLAGS_BACKUP

CFLAGS_BACKUP=$CFLAGS
CFLAGS="$CFLAGS -Werror"
AC_TRY_COMPILE(
  [
    #pragma GCC diagnostic push
    #pragma GCC diagnostic pop
    #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
    __attribute__((deprecated)) void test(void) {}
  ],
  [
    test();
  ],
  [AC_DEFINE(HAVE_DIAGNOSTIC_DEPRECATED_DECLARATIONS,
             1,
             [define 1 if GCC supports -Wdeprecated-declarations])])
CFLAGS=$CFLAGS_BACKUP

# Options
AC_ARG_ENABLE([img2sixel],
              [AS_HELP_STRING([--disable-img2sixel],
                              [whether to build img2sixel (default: yes)])],
              [],
              [enable_img2sixel=yes])
AM_CONDITIONAL(WANT_IMG2SIXEL, test x$enable_img2sixel != xno)

AC_ARG_ENABLE([sixel2png],
              [AS_HELP_STRING([--disable-sixel2png],
                              [whether to build sixel2png (default: yes)])],
              [],
              [enable_sixel2png=yes])
AM_CONDITIONAL(WANT_SIXEL2PNG, test x$enable_sixel2png != xno)

AC_ARG_WITH([gdk-pixbuf2],
            [AS_HELP_STRING([--with-gdk-pixbuf2],
                            [whether to build with gdk-pixbuf2 (default: no)])],
            [],
            [with_gdk_pixbuf2=no])

AC_ARG_WITH([gd],
            [AS_HELP_STRING([--with-gd],
                            [whether to build with gd (default: no)])],
            [],
            [with_gd=no])

AC_ARG_WITH([libcurl],
            [AS_HELP_STRING([--with-libcurl],
                            [whether to build with libcurl (default: auto)])],
            [],
            [with_libcurl=auto])

AC_ARG_WITH([jpeg],
            [AS_HELP_STRING([--with-jpeg],
                            [whether to build with libjpeg (default: auto)])],
            [],
            [with_jpeg=auto])

AC_ARG_WITH([png],
            [AS_HELP_STRING([--with-png],
                            [whether to build with libpng (default: auto)])],
            [],
            [with_png=auto])

#AC_ARG_WITH([wic],
#            [AS_HELP_STRING([--with-wic],
#                            [whether to build with windows WIC integration, windows only (default: no)])],
#            [],
#            [with_wic=no])

AC_ARG_WITH(pkgconfigdir,
            AC_HELP_STRING([--with-pkgconfigdir],
                           [Use the specified pkgconfig dir (default is libdir/pkgconfig)]),
                           [pkgconfigdir=${withval}],
                           [pkgconfigdir=${libdir}/pkgconfig])
AC_MSG_NOTICE([pkgconfig directory is ${pkgconfigdir}])
AC_SUBST(pkgconfigdir)

AC_ARG_WITH(bashcompletiondir,
            AC_HELP_STRING([--with-bashcompletiondir],
                           [Use the specified bashcompletion.d]),
                           [bashcompletiondir=${withval}],
                           [bashcompletiondir=${datadir}/bash-completion/completions])
AC_MSG_NOTICE([bash-completion directory is ${bashcompletiondir}])
AC_SUBST(bashcompletiondir)

AC_ARG_WITH(zshcompletiondir,
            AC_HELP_STRING([--with-zshcompletiondir],
                           [Use the specified zshcompletion.d]),
                           [zshcompletiondir=${withval}],
                           [zshcompletiondir=${datadir}/zsh/site-functions])
AC_MSG_NOTICE([zsh-completion directory is ${zshcompletiondir}])
AC_SUBST(zshcompletiondir)

AC_ARG_ENABLE([python],
              [AS_HELP_STRING([--enable-python],
                              [Python interface (default: yes)])],
              [],
              [])

AC_ARG_ENABLE([debug],
              [AS_HELP_STRING([--enable-debug],
                              [Use debug macro and specific CFLAGS])],
              [AC_DEFINE(HAVE_DEBUG, [1], [enable debugging support])],
              [enable_debug=no])
AM_CONDITIONAL([COND_DEBUG], [test x$enable_debug != xno])

AC_ARG_ENABLE([gcov],
              [AS_HELP_STRING([--enable-gcov],
                              [Use gcov])],
              [],
              [enable_gcov=no])
AM_CONDITIONAL([COND_GCOV], [test x$enable_gcov != xno])

AC_ARG_ENABLE([tests],
              [AS_HELP_STRING([--enable-tests],
                              [Build tests])],
              [AC_DEFINE(HAVE_TESTS, [1], [enable tests])],
              [enable_tests=no])
AM_CONDITIONAL([COND_TESTS], [test x$enable_tests != xno])

# Checks for programs.
AC_PROG_CC
AC_PROG_INSTALL
AS_IF([test x$cross_compile != xyes], [PKG_PROG_PKG_CONFIG], [])

AC_DEFUN([LS_CHECK_CFLAG], [
   AC_MSG_CHECKING([if $CC supports $1])
   saved_cflags="$CFLAGS"
   CFLAGS="$1 -Werror"
   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
                     [AC_MSG_RESULT([yes])
                      m4_default([$2], :)],
                     [AC_MSG_RESULT([no])
                      m4_default([$3], :)])
   CFLAGS="$saved_cflags"
])

CPPFLAGS="$CPPFLAGS -D_POSIX_SOURCE -D_POSIX_C_SOURCE=199309L"
LS_CHECK_CFLAG([-std=c99], [CFLAGS="$CFLAGS -std=c99"], [])
LS_CHECK_CFLAG([-Wall],[AM_CFLAGS="$AM_CFLAGS -Wall"], [])
LS_CHECK_CFLAG([-Wextra],[AM_CFLAGS="$AM_CFLAGS -Wextra"], [])
LS_CHECK_CFLAG([-Wformat=2],[AM_CFLAGS="$AM_CFLAGS -Wformat=2"], [])
LS_CHECK_CFLAG([-Wsign-conversion],
               [AC_DEFINE(HAVE_DIAGNOSTIC_SIGN_CONVERSION, 1, [define 1 if GCC supports -Wsign-conversion])])
LS_CHECK_CFLAG([-Wuninitialized],
               [AC_DEFINE(HAVE_DIAGNOSTIC_UNINITIALIZED, 1, [define 1 if GCC supports -Wuninitialized])])
LS_CHECK_CFLAG([-Wstrict-overflow],
               [AC_DEFINE(HAVE_DIAGNOSTIC_STRICT_OVERFLOW, 1, [define 1 if GCC supports -Wstrict-overeflow=1])])
LS_CHECK_CFLAG([-Wshadow],
               [AC_DEFINE(HAVE_DIAGNOSTIC_SHADOW, 1, [define 1 if GCC supports -Wshadow])])
LS_CHECK_CFLAG([-Wdouble-promotion],
               [AC_DEFINE(HAVE_DIAGNOSTIC_DOUBLE_PROMOTION, 1, [define 1 if GCC supports -Wdouble-promotion])])
LS_CHECK_CFLAG([-Wswitch-default],
               [AC_DEFINE(HAVE_DIAGNOSTIC_SWITCH_DEFAULT, 1, [define 1 if GCC supports -Wswitch-default])])
LS_CHECK_CFLAG([-Wunused-function],
               [AC_DEFINE(HAVE_DIAGNOSTIC_UNUSED_FUNCTION, 1, [define 1 if GCC supports -Wunused-function])])
LS_CHECK_CFLAG([-Wclobbered],
               [AC_DEFINE(HAVE_DIAGNOSTIC_CLOBBERED, 1, [define 1 if GCC supports -Wclobbered])])
LS_CHECK_CFLAG([-Bsymbolic],
               [AM_CFLAGS="$AM_CFLAGS -Bsymbolic"
                AC_DEFINE(HAVE_BSYMBOLIC, 1, [define 1 if GCC supports -Bsymbolic])])
AS_IF([test x$enable_debug = xyes],
      [LS_CHECK_CFLAG([-Werror], [AM_CFLAGS="$AM_CFLAGS -Werror"], [])])
AC_SUBST([AM_CFLAGS])

# For wic integration
#AC_PROG_CXX

# For test
AC_CHECK_PROGS(MD5SUM, [md5sum md5])
AC_SUBST(MD5SUM)

# Checks for libraries.

# Checks for header files.
AC_CHECK_HEADERS([memory.h \
                  stdlib.h \
                  string.h \
                  unistd.h \
                  stdint.h \
                  sys/unistd.h \
                  getopt.h \
                  sys/types.h \
                  sys/stat.h \
                  fcntl.h \
                  io.h \
                  errno.h \
                  limits.h \
                  sys/time.h \
                  time.h \
                  signal.h \
                  sys/select.h \
                  sys/signal.h \
                  termios.h \
                  sys/ioctl.h])

# Checks for typedefs, structures, and compiler characteristics.
#AC_CHECK_HEADER_STDBOOL
#AC_TYPE_SIZE_T
#AC_TYPE_UINT8_T

# Checks for library functions.
AC_FUNC_MALLOC
AC_FUNC_REALLOC

AC_CHECK_FUNC([memset], [],
              [AC_MSG_ERROR(memset is not available.)])

AC_CHECK_FUNC([getopt_long],
              [AC_DEFINE(HAVE_GETOPT_LONG, 1, [whether getopt_long is avilable])
               have_getopt_long=1],
              [AC_CHECK_FUNC([getopt],
                             [AC_DEFINE(HAVE_GETOPT, 1, [whether getopt is avilable])],
                             [AC_MSG_ERROR(getopt or getopt_long is not available.)])])
AM_CONDITIONAL([HAVE_GETOPT_LONG], [test x$have_getopt_long = xyes])

AC_CHECK_FUNCS([memcpy \
                memmove \
                setmode \
                _setmode \
                signal \
                nanosleep \
                strdup \
                strtoul \
                calloc \
                clock \
                clearerr \
                stat \
                setjmp \
                longjmp \
                strerror \
                isatty \
                strncmp \
                ldiv])

# for HDR
AC_CHECK_FUNCS([strtol pow])

AC_CHECK_DECLS([SIGINT, SIGTERM, SIGHUP],,,
               [
                   #ifdef HAVE_SIGNAL_H
                   # include <signal.h>
                   #elif HAVE_SYS_SIGNAL_H
                   # include <sys/signal.h>
                   #endif
               ])

loaders="stb_image"
have_curl="no" have_jpeg="no"
have_png="no"
#have_wic="no"

#if test x$with_wic != xno; then
#    AC_CHECK_HEADERS([wincodec.h], [],
#                     [AC_MSG_ERROR([WIC integration: wincodec.h is not avilable.])])
#    AC_CHECK_LIB([ole32], [main], [],
#                 [AC_MSG_ERROR([WIC integration: library ole32 is not avilable.])])
#    AC_CHECK_LIB([uuid], [main], [],
#                 [AC_MSG_ERROR([WIC integration: library uuid is not avilable.])])
#    AC_CHECK_LIB([windowscodecs], [main], [],
#                 [AC_MSG_ERROR([WIC integration: library wincodecs is not avilable.])])
#    have_wic="yes"
#fi

if test x$with_gdk_pixbuf2 != xno; then
    if test x${PKG_CONFIG} != x; then
        PKG_CHECK_MODULES([GDK_PIXBUF],
                          [gdk-pixbuf-2.0],
                          [have_gdk_pixbuf2=yes],
                          [have_gdk_pixbuf2=no])
        if test x$have_gdk_pixbuf2 != xno; then
            AC_MSG_NOTICE([gdk-pixbuf: $have_gdk_pixbuf2])
            AC_DEFINE(HAVE_GDK_PIXBUF2, 1, [whether gdk-pixbuf2 is available])
            loaders="${loaders} gdk-pixbuf2"
        else
            AC_MSG_ERROR([pkg-config is not available.])
        fi
    else
        if test x${GDK_PIXBUF_CFLAGS} = x || test x${GDK_PIXBUF_LIBS} = x; then
            AC_MSG_ERROR([please set GDK_PIXBUF_CFLAGS and GDK_PIXBUF_LIBS, or install pkg-config.])
        fi
    fi
    AC_MSG_NOTICE([gdk-pixbuf-2.0 cflags is ${GDK_PIXBUF_CFLAGS}])
    AC_MSG_NOTICE([gdk-pixbuf-2.0 libs is ${GDK_PIXBUF_LIBS}])
fi
AC_SUBST(GDK_PIXBUF_CFLAGS)
AC_SUBST(GDK_PIXBUF_LIBS)


if test x$with_gd != xno; then
    CFLAGS_BACKUP=$CFLAGS
    LDFLAGS_BACKUP=$LDFLAGS
    if test x$with_gd != xyes -a x$with_gd != xauto; then
        if test ! -d "$with_gd"; then
            AC_MSG_ERROR(["${with_gd}" is not directory])
        fi
        ADDED_CFLAGS="-I${with_gd}/include"
        ADDED_LIBS="-L${with_gd}/lib -lgd"
    else
        if test x${prefix} != x -a x${prefix} != xNONE; then
            ADDED_CFLAGS="-I${prefix}/include"
            ADDED_LIBS="-L${prefix}/lib -lgd"
        else
            ADDED_CFLAGS="-I/usr/local/include"
            ADDED_LIBS="-L/usr/local/lib -lgd"
        fi
    fi
    CFLAGS="${CFLAGS} ${GD_CFLAGS}"
    LDFLAGS="${LDFLAGS} ${GD_LIBS}"
    AC_CHECK_HEADER([gd.h],
                    [AC_CHECK_LIB([gd],
                                  [gdImageCreateFromGifPtr],
                                  [have_gd="yes"
                                   GD_CFLAGS=$ADDED_CFLAGS
                                   GD_LIBS=$ADDED_LIBS],
                                  [have_gd="no"])])
    CFLAGS=$CFLAGS_BACKUP
    LDFLAGS=$LDFLAGS_BACKUP
    if test x${PKG_CONFIG} != x; then
        if test x$have_gd != xyes -a ! -d "$with_gd"; then
            PKG_CHECK_MODULES(GD, [gdlib], [have_gd=yes], [have_gd=no])
        fi
    fi
    if test x$have_gd = xyes; then
        CFLAGS_BACKUP=$CFLAGS
        LDFLAGS_BACKUP=$LDFLAGS
        CFLAGS="$CFLAGS $GD_CFLAGS"
        LDFLAGS="${LDFLAGS} ${GD_LIBS}"
        AC_CHECK_LIB([gd],
                     [gdImageCreateFromGifPtr],
                     [AC_CHECK_DECLS([gdImageCreateFromGifPtr],   [], [], [ #include <gd.h> ])])
        AC_CHECK_LIB([gd],
                     [gdImageCreateFromPngPtr],
                     [AC_CHECK_DECLS([gdImageCreateFromPngPtr],   [], [], [ #include <gd.h> ])])
        AC_CHECK_LIB([gd],
                     [gdImageCreateFromBmpPtr],
                     [AC_CHECK_DECLS([gdImageCreateFromBmpPtr],   [], [], [ #include <gd.h> ])])
        AC_CHECK_LIB([gd],
                     [gdImageCreateFromJpegPtrEx],
                     [AC_CHECK_DECLS([gdImageCreateFromJpegPtrEx],[], [], [ #include <gd.h> ])])
        AC_CHECK_LIB([gd],
                     [gdImageCreateFromJpegPtr],
                     [AC_CHECK_DECLS([gdImageCreateFromJpegPtr],  [], [], [ #include <gd.h> ])])
        AC_CHECK_LIB([gd],
                     [gdImageCreateFromTgaPtr],
                     [AC_CHECK_DECLS([gdImageCreateFromTgaPtr],   [], [], [ #include <gd.h> ])])
        AC_CHECK_LIB([gd],
                     [gdImageCreateFromWBMPPtr],
                     [AC_CHECK_DECLS([gdImageCreateFromWBMPPtr],  [], [], [ #include <gd.h> ])])
        AC_CHECK_LIB([gd],
                     [gdImageCreateFromTiffPtr],
                     [AC_CHECK_DECLS([gdImageCreateFromTiffPtr], [], [], [ #include <gd.h> ])])
        AC_CHECK_LIB([gd],
                     [gdImageCreateFromGd2Ptr],
                     [AC_CHECK_DECLS([gdImageCreateFromGd2Ptr],   [], [], [ #include <gd.h> ])])
        AC_CHECK_LIB([gd],
                     [gdImagePaletteToTrueColor],
                     [AC_CHECK_DECLS([gdImagePaletteToTrueColor], [], [], [ #include <gd.h> ])])
        CFLAGS=$CFLAGS_BACKUP
        LDFLAGS=$LDFLAGS_BACKUP
        AC_DEFINE(HAVE_GD, 1, [whether gd is available])
        loaders="${loaders} gd"
    else
        GD_CFLAGS=
        GD_LIBS=
        AC_MSG_ERROR(gd is not available.)
    fi

    case $host in
        *-*-cygwin)
            AC_CHECK_LIB(iconv, [libiconv], [],
                         [AC_CHECK_LIB(iconv, [iconv], [],
                                       [AC_MSG_ERROR([please install libiconv])])
                         ])
            ;;
        *-*-interix)
            AM_CPPFLAGS="-D_ALL_SOURCES"
            AC_SUBST([AM_CPPFLAGS])
            ;;
    esac

    AC_MSG_NOTICE([gd cflags is ${GD_CFLAGS}])
    AC_MSG_NOTICE([gd libs is ${GD_LIBS}])
fi
AC_SUBST(GD_CFLAGS)
AC_SUBST(GD_LIBS)

if test x$with_libcurl != xno; then
    if test x$build = x$host; then
        CFLAGS_BACKUP=$CFLAGS
        LDFLAGS_BACKUP=$LDFLAGS
        if test x$with_libcurl != xyes -a x$with_libcurl != xauto; then
            if test ! -d "$with_libcurl"; then
                AC_MSG_ERROR(["${with_libcurl}" is not directory])
            fi
            ADDED_CFLAGS="-I${with_libcurl}/include"
            ADDED_LIBS="-L${with_libcurl}/lib -lcurl"
        else
            if test x${prefix} != x -a x${prefix} != xNONE; then
                ADDED_CFLAGS="-I${prefix}/include"
                ADDED_LIBS="-L${prefix}/lib -lcurl"
            else
                ADDED_CFLAGS="-I/usr/local/include"
                ADDED_LIBS="-L/usr/local/lib -lcurl"
            fi
        fi
        CFLAGS="${CFLAGS} ${ADDED_CFLAGS}"
        LDFLAGS="${LDFLAGS} ${ADDED_LIBS}"
        AC_CHECK_HEADER([curl/curl.h],
                        [AC_CHECK_LIB([curl],
                                      [curl_easy_cleanup],
                                      [have_curl=yes
                                       LIBCURL_CFLAGS=$ADDED_CFLAGS
                                       LIBCURL_LIBS=$ADDED_LIBS],
                                      [have_curl=no])])
        CFLAGS=$CFLAGS_BACKUP
        LDFLAGS=$LDFLAGS_BACKUP
        if test x$have_curl != xyes -a ! -d "$with_libcurl"; then
            if test x${PKG_CONFIG} != x; then
                PKG_CHECK_MODULES(LIBCURL,
                                  [libcurl],
                                  [have_curl=yes],
                                  [have_curl=no])
            fi
        fi
    fi
    if test x$have_curl = xyes; then
        AC_DEFINE(HAVE_LIBCURL, 1, [whether libcurl is available])
    else
        if test x$with_libcurl != xauto; then
            AC_MSG_ERROR([unable to find libcurl])
        fi
        AC_MSG_NOTICE([libcurl is not available])
    fi
    AC_MSG_NOTICE([libcurl cflags is ${LIBCURL_CFLAGS}])
    AC_MSG_NOTICE([libcurl libs is ${LIBCURL_LIBS}])
fi
AC_SUBST(LIBCURL_CFLAGS)
AC_SUBST(LIBCURL_LIBS)

if test x$with_jpeg != xno; then
    if test x$build = x$host; then
        CFLAGS_BACKUP=$CFLAGS
        LDFLAGS_BACKUP=$LDFLAGS
        if test x$with_jpeg != xyes -a x$with_jpeg != xauto; then
            if test ! -d "$with_jpeg"; then
                AC_MSG_ERROR(["${with_jpeg}" is not directory])
            fi
            ADDED_CFLAGS="-I${with_jpeg}/include"
            ADDED_LIBS="-L${with_jpeg}/lib -ljpeg"
        else
            if test x${prefix} != x -a x${prefix} != xNONE; then
                ADDED_CFLAGS="-I${prefix}/include"
                ADDED_LIBS="-L${prefix}/lib -ljpeg"
            else
                ADDED_CFLAGS="-I/usr/local/include"
                ADDED_LIBS="-L/usr/local/lib -ljpeg"
            fi
        fi
        CFLAGS="${CFLAGS} ${ADDED_CFLAGS}"
        LDFLAGS="${LDFLAGS} ${ADDED_LIBS}"
        AC_CHECK_HEADER([jpeglib.h],
                        [AC_CHECK_LIB([jpeg],
                                      [jpeg_read_header],
                                      [have_jpeg=yes
                                       LIBJPEG_CFLAGS=$ADDED_CFLAGS
                                       LIBJPEG_LIBS=$ADDED_LIBS],
                                      [have_jpeg=no])])
        CFLAGS=$CFLAGS_BACKUP
        LDFLAGS=$LDFLAGS_BACKUP
        if test x$have_jpeg != xyes -a ! -d "$with_jpeg"; then
            if test x${PKG_CONFIG} != x; then
                PKG_CHECK_MODULES(LIBJPEG,
                                  [libjpeg],
                                  [have_jpeg=yes],
                                  [have_jpeg=no])
            fi
        fi
    fi
    if test x$have_jpeg = xyes; then
        LIBJPEG_CFLAGS=$ADDED_CFLAGS
        LIBJPEG_LIBS=$ADDED_LIBS
        AC_DEFINE(HAVE_JPEG, 1, [whether jpeg codec library is available])
        loaders="${loaders} jpeg"
        AC_MSG_NOTICE([jpeg cflags is ${LIBJPEG_CFLAGS}])
        AC_MSG_NOTICE([jpeg libs is ${LIBJPEG_LIBS}])
    else
        if test x$with_jpeg != xauto; then
            AC_MSG_ERROR([unable to find jpeg codec library])
        fi
        AC_MSG_NOTICE([libjpeg is not available])
    fi
fi
AC_SUBST(LIBJPEG_CFLAGS)
AC_SUBST(LIBJPEG_LIBS)

if test x$with_png != xno; then
    if test x$build = x$host; then
        CFLAGS_BACKUP=$CFLAGS
        LDFLAGS_BACKUP=$LDFLAGS
        if test x$with_png != xyes -a x$with_png != xauto; then
            if test ! -d "$with_png"; then
                AC_MSG_ERROR(["${with_png}" is not directory])
            fi
            ADDED_CFLAGS="-I${with_png}/include"
            ADDED_LIBS="-L${with_png}/lib -lpng"
        else
            if test x${prefix} != x -a x${prefix} != xNONE; then
                ADDED_CFLAGS="-I${prefix}/include"
                ADDED_LIBS="-L${prefix}/lib -lpng"
            else
                ADDED_CFLAGS="-I/usr/local/include"
                ADDED_LIBS="-L/usr/local/lib -lpng"
            fi
        fi
        CFLAGS="${CFLAGS} ${ADDED_CFLAGS}"
        LDFLAGS="${LDFLAGS} ${ADDED_LIBS}"
        AC_CHECK_HEADER([png.h],
                        [AC_CHECK_LIB([png],
                                      [png_check_sig],
                                      [have_png=yes
                                       LIBPNG_CFLAGS=$ADDED_CFLAGS
                                       LIBPNG_LIBS=$ADDED_LIBS],
                                      [have_png=no])])
        CFLAGS=$CFLAGS_BACKUP
        LDFLAGS=$LDFLAGS_BACKUP
        if test x$have_png != xyes -a ! -d "$with_png"; then
            if test x${PKG_CONFIG} != x; then
                PKG_CHECK_MODULES(LIBPNG,
                                  [libpng],
                                  [have_png=yes],
                                  [have_png=no])
            fi
        fi
    fi
    if test x$have_png = xyes; then
        CFLAGS="${CFLAGS} ${LIBPNG_CFLAGS}"
        LDFLAGS="${LDFLAGS} ${LIBPNG_LIBS}"
        AC_CHECK_DECLS([png_set_gray_1_2_4_to_8, png_set_expand_gray_1_2_4_to_8],
                       [], [], [ #include <png.h> ])
        CFLAGS=$CFLAGS_BACKUP
        LDFLAGS=$LDFLAGS_BACKUP
        AC_DEFINE(HAVE_LIBPNG, 1, [whether libpng is available])
        loaders="${loaders} png"
        AC_MSG_NOTICE([libpng cflags is ${LIBPNG_CFLAGS}])
        AC_MSG_NOTICE([libpng libs is ${LIBPNG_LIBS}])
    else
        if test x$with_png != xauto; then
            AC_MSG_ERROR([unable to find libpng])
        fi
        AC_MSG_NOTICE([libpng is not available])
    fi
fi
AC_SUBST(LIBPNG_CFLAGS)
AC_SUBST(LIBPNG_LIBS)

have_python=no
if test x$enable_python != xno; then
    AM_PATH_PYTHON([2.3], [have_python=yes], [have_python=no])
    if test x$enable_python = xyes -a x$have_python = xno; then
        AC_MSG_ERROR([python is not available])
    fi
fi
AM_CONDITIONAL([HAVE_PYTHON], [test x$have_python = xyes])
if test x$have_python = xyes; then
    message_python="$have_python: $pythondir"
else
    message_python=$have_python
fi

AC_DEFUN([LS_UPDATE_TIMESTAMP], [
          touch -c aclocal.m4 Makefile.in configure config.h.in \
                   converters/Makefile.in include/Makefile.in \
                   python/Makefile.in src/Makefile.in tools/Makefile.in
          ])
LS_UPDATE_TIMESTAMP

AM_CONDITIONAL([HAVE_JPEG], [test x$have_jpeg = xyes])
AM_CONDITIONAL([HAVE_PNG], [test x$have_png = xyes])
AM_CONDITIONAL([HAVE_CURL], [test x$have_curl = xyes])

AC_CONFIG_FILES([Makefile
                 libsixel.pc
                 package.json.in
                 include/sixel.h
                 src/Makefile
                 include/Makefile
                 converters/Makefile
                 tools/Makefile
                 tools/libsixel-config
                 python/Makefile
                ])

AC_OUTPUT

echo ""
echo ""
echo "libsixel was configured as follows"
echo ""
echo "       Loader component    : $loaders"
echo "       libcurl integration : $have_curl"
echo "       pkg-config dir      : $pkgconfigdir"
echo "       Bash completion dir : $bashcompletiondir"
echo "       Zsh completion dir  : $zshcompletiondir"
#echo "       WIC integration     : $have_wic"
echo "       python bindings     : $message_python"
echo "       gcov integration    : $enable_gcov"
echo "       debugging           : $enable_debug"
echo "       tests               : $enable_tests"
echo ""
echo ""