if test "x$with_composite" != "xno"; then
  dnl XComposite check
  KDE_CHECK_HEADER(X11/extensions/Xcomposite.h, [xcomposite_h=yes], [xcomposite_h=no], [#include <X11/Xlib.h>])
  if test "$xcomposite_h" = yes; then
    KDE_CHECK_LIB(Xcomposite, XCompositeQueryExtension, [
      LIB_XCOMPOSITE=-lXcomposite
      AC_DEFINE_UNQUOTED(HAVE_XCOMPOSITE, 1, [Define if you have the XComposite extension])
    ], [], -lXext -lX11 $X_EXTRA_LIBS)
  else
    LIB_XCOMPOSITE=
  fi
  AC_SUBST(LIB_XCOMPOSITE)
fi

dnl XFixes check
KDE_CHECK_HEADER(X11/extensions/Xfixes.h, [xfixes_h=yes], [xfixes_h=no], [#include <X11/Xlib.h>])
if test "$xfixes_h" = yes; then
  KDE_CHECK_LIB(Xfixes, XFixesQueryExtension, [
    LIB_XFIXES=-lXfixes
    AC_DEFINE_UNQUOTED(HAVE_XFIXES, 1, [Define if you have the XFixes extension])
  ], [], -lXext -lX11 $X_EXTRA_LIBS)
else
  LIB_XFIXES=
fi
AC_SUBST(LIB_XFIXES)