checking for X extensions

[Sam Steingold]

what is the right way to check for X extensions with autoconf 2.54?
Right now, we use

AC_PATH_XTRA
dnl Look for Xpm
AC_CACHE_CHECK(for Xpm library, gb_cv_have_xpm,
  [ gb_LIBS_save=$LIBS
    gb_CFLAGS_save=$CFLAGS
    LIBS="$X_LIBS -lXpm $X_PRE_LIBS -lX11 $LIBS"
    CFLAGS="$CFLAGS $X_CFLAGS"
    AC_TRY_LINK([#include <X11/xpm.h>],
                [XpmReadFileToPixmap(0,0,0,0,0,0);],
      gb_cv_have_xpm=yes,
      gb_cv_have_xpm=no)
    LIBS=$gb_LIBS_save
    CFLAGS=$gb_CFLAGS_save])

dnl Same thing with XShape
AC_CACHE_CHECK(for X shape extension, gb_cv_have_xshape,
  [ gb_LIBS_save=$LIBS
    gb_CFLAGS_save=$CFLAGS
    LIBS="$X_LIBS -lXext $X_PRE_LIBS -lX11 $LIBS"
    CFLAGS="$CFLAGS $X_CFLAGS"
    AC_TRY_LINK([#include <X11/Xlib.h>
                 #include <X11/Xutil.h>
                 #include <X11/extensions/shape.h>],
                [XShapeQueryExtension(0,0,0);],
      gb_cv_have_xshape=yes,
      gb_cv_have_xshape=no)
    LIBS=$gb_LIBS_save
    CFLAGS=$gb_CFLAGS_save])

Is there an equivalent standard idiom?

AC_SEARCH_LIBS comes to mind, of course, but it does not permit
additional #includes...  Or maye they are not necessary at all?

Thanks!


-- 
Sam Steingold (http://www.podval.org/~sds) running w2k
<http://www.camera.org> <http://www.iris.org.il> <http://www.memri.org/>
<http://www.mideasttruth.com/> <http://www.honestreporting.com>
There are 10 kinds of people: those who count in binary and those who do not.