Explicitly check for and link to -lXrender.

See http://lists.gnu.org/archive/html/emacs-devel/2010-01/msg00656.html

* configure.in: Explicitly check for and link to -lXrender.

ChangeLog

+2010-01-12  Chong Yidong  <cyd@stupidchicken.com>
+
+	* configure.in: Explicitly check for and link to -lXrender.
+
 2010-01-12  Glenn Morris  <rgm@gnu.org>
 
 	* INSTALL.BZR, README: Use bug-gnu-emacs rather than emacs-pretest-bug

configure

@@ -13663,12 +13663,85 @@ $as_echo "no" >&6; }
      HAVE_XFT=no
   fi
 
-      if test "$HAVE_XFT" != no; then
+      ## Because xftfont.c uses XRenderQueryExtension, we also
+      ## need to link to -lXrender.
+      HAVE_XRENDER=no
+      { $as_echo "$as_me:$LINENO: checking for XRenderQueryExtension in -lXrender" >&5
+$as_echo_n "checking for XRenderQueryExtension in -lXrender... " >&6; }
+if test "${ac_cv_lib_Xrender_XRenderQueryExtension+set}" = set; then
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lXrender  $LIBS"
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char XRenderQueryExtension ();
+int
+main ()
+{
+return XRenderQueryExtension ();
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
+$as_echo "$ac_try_echo") >&5
+  (eval "$ac_link") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest$ac_exeext && {
+	 test "$cross_compiling" = yes ||
+	 $as_test_x conftest$ac_exeext
+       }; then
+  ac_cv_lib_Xrender_XRenderQueryExtension=yes
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	ac_cv_lib_Xrender_XRenderQueryExtension=no
+fi
+
+rm -rf conftest.dSYM
+rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
+      conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:$LINENO: result: $ac_cv_lib_Xrender_XRenderQueryExtension" >&5
+$as_echo "$ac_cv_lib_Xrender_XRenderQueryExtension" >&6; }
+if test $ac_cv_lib_Xrender_XRenderQueryExtension = yes; then
+  HAVE_XRENDER=yes
+fi
+
+      if test "$HAVE_XFT" != no && test "$HAVE_XRENDER" != no; then
 	OLD_CPPFLAGS="$CPPFLAGS"
 	OLD_CFLAGS="$CFLAGS"
 	OLD_LIBS="$LIBS"
 	CPPFLAGS="$CPPFLAGS $XFT_CFLAGS"
 	CFLAGS="$CFLAGS $XFT_CFLAGS"
+	XFT_LIBS="-lXrender $XFT_LIBS"
 	LIBS="$XFT_LIBS $LIBS"
 	if test "${ac_cv_header_X11_Xft_Xft_h+set}" = set; then
   { $as_echo "$as_me:$LINENO: checking for X11/Xft/Xft.h" >&5

configure.in

@@ -1984,12 +1984,17 @@ if test "${HAVE_X11}" = "yes"; then
     if test "x${with_xft}" != "xno"; then
 
       PKG_CHECK_MODULES(XFT, xft >= 0.13.0, , HAVE_XFT=no)
-      if test "$HAVE_XFT" != no; then
+      ## Because xftfont.c uses XRenderQueryExtension, we also
+      ## need to link to -lXrender.
+      HAVE_XRENDER=no
+      AC_CHECK_LIB(Xrender, XRenderQueryExtension, HAVE_XRENDER=yes)
+      if test "$HAVE_XFT" != no && test "$HAVE_XRENDER" != no; then
 	OLD_CPPFLAGS="$CPPFLAGS"
 	OLD_CFLAGS="$CFLAGS"
 	OLD_LIBS="$LIBS"
 	CPPFLAGS="$CPPFLAGS $XFT_CFLAGS"
 	CFLAGS="$CFLAGS $XFT_CFLAGS"
+	XFT_LIBS="-lXrender $XFT_LIBS"
 	LIBS="$XFT_LIBS $LIBS"
 	AC_CHECK_HEADER(X11/Xft/Xft.h,
 	  AC_CHECK_LIB(Xft, XftFontOpen, HAVE_XFT=yes, , $XFT_LIBS))