configure.ac

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        LIBS="$save_LIBS"
        CFLAGS="$save_CFLAGS"

        # More AIX lossage: must compile with cc_r
        AC_CHECK_PROG(PTHREAD_CC, cc_r, cc_r, ${CC})
else
        PTHREAD_CC="$CC"
fi

AC_SUBST(PTHREAD_LIBS)
AC_SUBST(PTHREAD_CFLAGS)
AC_SUBST(PTHREAD_CC)

# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
if test x"$acx_pthread_ok" = xyes; then
        ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
        :
else
        acx_pthread_ok=no
        $2
fi
AC_LANG_RESTORE
])dnl ACX_PTHREAD

dnl do we need to specify -lm explicitly?
AC_CHECK_FUNC(sin,,[AC_CHECK_LIB(m,sin)])

dnl zlib is required
AC_CHECK_LIB(z,deflate,
  [LIBS="-lz $LIBS"
   AC_DEFINE(HAVE_LIBZ, 1, [ Define if you have zlib. ])],
  [AC_MSG_WARN([zlib is required - see http://www.gzip.org/zlib/])])

dnl libpng is required
AC_ARG_WITH(png,dnl
[  --with-png=DIR          where to find the png library],,
  withval=yes)

# libpng12.so is a nightmare. We have to test separately for
# libpng12-config and libpng-config. If we find libpng12-config,
# we don't look for the other, which will just be a symlink to it,
# confusing autoconf into thinking the library itself will be named -lpng,
# which it won't be. Awful. This code will suffice unless the libpng
# authors decide to do this AGAIN. Which I really hope they won't. TBB

if test "$withval" != no; then
  AC_PATH_PROG([LIBPNG12_CONFIG], [libpng12-config])
  AC_PATH_PROG([LIBPNG_CONFIG], [libpng-config])
  if test -n "$LIBPNG12_CONFIG"; then
    libpng_CPPFLAGS=`libpng12-config --cflags`
    # should be --ldopts, but it's currently broken
    libpng_LDFLAGS=`libpng12-config --ldflags`
    libpng_LDFLAGS=`echo " $libpng_LDFLAGS" | sed 's/ -l[[^ ]][[^ ]]*//g'`
  elif test -n "$LIBPNG_CONFIG"; then
    libpng_CPPFLAGS=`libpng-config --cflags`
    # should be --ldopts, but it's currently broken
    libpng_LDFLAGS=`libpng-config --ldflags`
    libpng_LDFLAGS=`echo " $libpng_LDFLAGS" | sed 's/ -l[[^ ]][[^ ]]*//g'`
  elif test -d "$withval"; then
    libpng_CPPFLAGS="-I$withval/include"
    libpng_LDFLAGS="-L$withval/lib"
  fi

  AC_CHECK_HEADERS(png.h,,
    [AC_CHECK_HEADERS(libpng/png.h,
       [CPPFLAGS="$CPPFLAGS $libpng_CPPFLAGS/libpng"],
       [CPPFLAGS="$_cppflags"])])

  _ldflags="$LDFLAGS"
  LDFLAGS="$libpng_LDFLAGS $LDFLAGS"

  if test -n "$LIBPNG12_CONFIG"; then
    AC_CHECK_LIB(png12,png_create_read_struct,
      [LIBS="-lpng12 $LIBS"
       FEATURES="GD_PNG $FEATURES"
       AC_DEFINE(HAVE_LIBPNG, 1, [ Define if you have the png library. ])],
      [LDFLAGS="$_ldflags"  
       AC_MSG_WARN([libpng is required - see http://www.libpng.org/pub/png/])])
  elif test -n "$LIBPNG_CONFIG"; then
    AC_CHECK_LIB(png,png_create_read_struct,
      [LIBS="-lpng $LIBS" 
       FEATURES="GD_PNG $FEATURES"
       AC_DEFINE(HAVE_LIBPNG, 1, [ Define if you have the png library. ])],
      [LDFLAGS="$_ldflags"  
       AC_MSG_WARN([libpng is required - see http://www.libpng.org/pub/png/])])
  else
    AC_CHECK_LIB(png,png_create_read_struct,
      [LIBS="-lpng $LIBS" 
       FEATURES="GD_PNG $FEATURES"
       AC_DEFINE(HAVE_LIBPNG, 1, [ Define if you have the png library. ])],
      [LDFLAGS="$_ldflags"  
       AC_MSG_WARN([libpng is required - see http://www.libpng.org/pub/png/])])
  fi
else
  ac_cv_lib_png_png_create_read_struct=no
  AC_MSG_WARN([libpng is required - see http://www.libpng.org/pub/png/])
fi

#TBB: png12's png_create_read_struct is just as good 
#2.0.23: should be = not ==  
if test "$ac_cv_lib_png12_png_create_read_struct" = yes; then
  ac_cv_lib_png_png_create_read_struct=yes
fi 

dnl FreeType configure tests snarfed from libwmf ..
AC_ARG_WITH(freetype,dnl
[  --with-freetype=DIR     where to find the freetype 2.x library],
  [if test "$withval" != no; then
     if test "$withval" != yes; then
       FREETYPE_DIR=$withval
     fi
   fi])

if test "$withval" != no; then

  if test -n "$FREETYPE_DIR"; then
    AC_PATH_PROG(FREETYPE_CONFIG,freetype-config,,[$FREETYPE_DIR/bin:$PATH])
  else
    AC_PATH_PROG(FREETYPE_CONFIG,freetype-config)
  fi

  if test -n "$FREETYPE_CONFIG"; then
    if test -n "$FREETYPE_DIR"; then
      libft_INCLUDES="`$FREETYPE_CONFIG --cflags` -I$FREETYPE_DIR/include"
    else
      libft_INCLUDES=`$FREETYPE_CONFIG --cflags`
    fi
    libft_LDFLAGS=`$FREETYPE_CONFIG --libs`
    libft_LDFLAGS=`echo " $libft_LDFLAGS" |sed 's/ -l[[^ ]][[^ ]]*//g'`
  else
    if test -n "$FREETYPE_DIR"; then
      libft_INCLUDES="-I$FREETYPE_DIR/include/freetype2 -I$FREETYPE_DIR/include"
      libft_LDFLAGS="-L$FREETYPE_DIR/lib"
    else
      libft_INCLUDES=""
      libft_LDFLAGS=""
    fi
  fi

  _cppflags="$CPPFLAGS"
  _ldflags="$LDFLAGS"
  CPPFLAGS="$libft_INCLUDES $CPPFLAGS"
  LDFLAGS="$libft_LDFLAGS $LDFLAGS"
  SAVE_FEATURES=$FEATURES
  AC_CHECK_LIB(freetype,FT_Init_FreeType,
    [LIBS="-lfreetype $LIBS" 
     FEATURES="GD_FREETYPE $FEATURES"
     AC_DEFINE(HAVE_LIBFREETYPE, 1, [ Define if you have the freetype library. ])],
    [LDFLAGS="$_ldflags"
     AC_MSG_WARN([not found - disabling freetype support])
     FEATURES=$SAVE_FEATURES])

  #TBB: 2.0.26: newer gd versions require ft2build.h
  AC_CHECK_HEADERS(ft2build.h,,
      [AC_MSG_RESULT([no])
      FEATURES=$SAVE_FEATURES
      ac_cv_lib_freetype_FT_Init_FreeType=no
      CPPFLAGS="$_cppflags"])

else
  ac_cv_lib_freetype_FT_Init_FreeType=no
fi

dnl check for libfontconfig by default
AC_ARG_WITH(fontconfig,dnl
[  --with-fontconfig=DIR         where to find the fontconfig library],
  [if test -d "$withval"; then
     LDFLAGS="$LDFLAGS -L$withval/lib"
     CPPFLAGS="$CPPFLAGS -I$withval/include"
   fi],
  withval=yes)

if test "$withval" != no; then
  AC_CHECK_LIB(fontconfig,FcInit,
    [LIBS="-lfontconfig $LIBS" 
     FEATURES="GD_FONTCONFIG $FEATURES"
     AC_DEFINE(HAVE_LIBFONTCONFIG, 1, [ Define if you have the fontconfig library. ])])
else
  ac_cv_lib_fontconfig_FcInit=no
fi

dnl check for libjpeg by default
AC_ARG_WITH(jpeg,dnl
[  --with-jpeg=DIR         where to find the jpeg library],
  [if test -d "$withval"; then
     LDFLAGS="$LDFLAGS -L$withval/lib"
     CPPFLAGS="$CPPFLAGS -I$withval/include"
   fi],
  withval=yes)

if test "$withval" != no; then
  AC_CHECK_LIB(jpeg,jpeg_set_defaults,
    [LIBS="-ljpeg $LIBS" 
     FEATURES="GD_JPEG $FEATURES"
     AC_DEFINE(HAVE_LIBJPEG, 1, [ Define if you have the jpeg library. ])])
else
  ac_cv_lib_jpeg_jpeg_set_defaults=no
fi

dnl check for libXpm by default
AC_ARG_WITH(xpm,dnl
[  --with-xpm=DIR          where to find the xpm library],
  [if test -d "$withval"; then
     LDFLAGS="$LDFLAGS -L$withval/lib"
     CPPFLAGS="$CPPFLAGS -I$withval/include"
   fi],
  withval=yes)

if test "$withval" != no; then
  AC_CHECK_LIB(Xpm,XpmReadFileToXpmImage,
    [LIBS="-lXpm -lX11 $LIBS"
     FEATURES="GD_XPM $FEATURES"
     AC_DEFINE(HAVE_LIBXPM, 1, [ Define if you have the Xpm library. ])],,
    [-lX11])
else
  ac_cv_lib_Xpm_XpmReadFileToXpmImage=no
fi

ACX_PTHREAD()

dnl report configuration
AC_MSG_RESULT([
** Configuration summary for $PACKAGE $VERSION:

   Support for PNG library:          $ac_cv_lib_png_png_create_read_struct
   Support for JPEG library:         $ac_cv_lib_jpeg_jpeg_set_defaults
   Support for Freetype 2.x library: $ac_cv_lib_freetype_FT_Init_FreeType
   Support for Fontconfig library:   $ac_cv_lib_fontconfig_FcInit
   Support for Xpm library:          $ac_cv_lib_Xpm_XpmReadFileToXpmImage
   Support for pthreads:             $acx_pthread_ok
])

AC_CONFIG_FILES([Makefile config/Makefile config/gdlib-config test/Makefile])

AC_OUTPUT