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dnl PKG_CHECK_MODULES(GSTUFF, gtk+-2.0 >= 1.3 glib = 1.3.4, action-if, action-not)

dnl defines GSTUFF_LIBS, GSTUFF_CFLAGS, see pkg-config man page

dnl also defines GSTUFF_PKG_ERRORS on error

AC_DEFUN([PKG_CHECK_MODULES], [

  succeeded=no

  if test -z "$PKG_CONFIG"; then

    AC_PATH_PROG(PKG_CONFIG, pkg-config, no)

  fi

  if test "$PKG_CONFIG" = "no" ; then

     echo "*** The pkg-config script could not be found. Make sure it is"

     echo "*** in your path, or set the PKG_CONFIG environment variable"

     echo "*** to the full path to pkg-config."

     echo "*** Or see http://www.freedesktop.org/software/pkgconfig to get pkg-config."

  else

     PKG_CONFIG_MIN_VERSION=0.9.0

     if $PKG_CONFIG --atleast-pkgconfig-version $PKG_CONFIG_MIN_VERSION; then

        AC_MSG_CHECKING(for $2)

        if $PKG_CONFIG --exists "$2" ; then

            AC_MSG_RESULT(yes)

            succeeded=yes

            AC_MSG_CHECKING($1_CFLAGS)

            $1_CFLAGS=`$PKG_CONFIG --cflags "$2"`

            AC_MSG_RESULT($$1_CFLAGS)

            AC_MSG_CHECKING($1_LIBS)

            $1_LIBS=`$PKG_CONFIG --libs "$2"`

            AC_MSG_RESULT($$1_LIBS)

        else

            $1_CFLAGS=""

            $1_LIBS=""

            ## If we have a custom action on failure, don't print errors, but

            ## do set a variable so people can do so.

            $1_PKG_ERRORS=`$PKG_CONFIG --errors-to-stdout --print-errors "$2"`

            ifelse([$4], ,echo $$1_PKG_ERRORS,)

        fi

        AC_SUBST($1_CFLAGS)

        AC_SUBST($1_LIBS)

     else

        echo "*** Your version of pkg-config is too old. You need version $PKG_CONFIG_MIN_VERSION or newer."

        echo "*** See http://www.freedesktop.org/software/pkgconfig"

     fi

  fi

  if test $succeeded = yes; then

     ifelse([$3], , :, [$3])

  else

     ifelse([$4], , AC_MSG_ERROR([Library requirements ($2) not met; consider adjusting the PKG_CONFIG_PATH environment variable if your libraries are in a nonstandard prefix so pkg-config can find them.]), [$4])

  fi

])