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@@ -1,3 +1,16 @@
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+2008-08-09  Marco Barisione  <marco.barisione@collabora.co.uk>
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+
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+        Reviewed by Alp Toker.
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+
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+        http://bugs.webkit.org/show_bug.cgi?id=19045
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+        [gtk] ./configure doesn't check for x toolkit availability
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+
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+        Some old versions of Xt do not provide xt.pc, in this case use
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+        AC_CHECK_LIB to check if the library is installed and then fall back
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+        to using just -lXt.
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+
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+        * configure.ac:
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+
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 2008-08-09  Alp Toker  <alp@nuanti.com>
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         GTK+ build fixes.

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@@ -291,7 +291,19 @@ AC_SUBST([WEBKITDEPS_LIBS])
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 # check for Xt if the target is X11
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 if test "$with_target" = "x11"; then
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    PKG_CHECK_MODULES([XT],
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-                     [xt])
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+                     [xt],
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+                     [xt_has_pkg_config=yes],
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+                     [xt_has_pkg_config=no])
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+   # some old versions of Xt do not provide xt.pc, so try to link against Xt
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+   # and if it's installed fall back to just adding -lXt
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+   if test "$xt_has_pkg_config" = "no"; then
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+      # using AC_CHECK_LIB instead of AC_SEARCH_LIB is fine in this case as
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+      # we don't care about the XtOpenDisplay symbol but only about the
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+      # existence of libXt
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+      AC_CHECK_LIB([Xt], [XtOpenDisplay],
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+                   [XT_CFLAGS=""; XT_LIBS="-lXt"],
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+                   [AC_MSG_ERROR([X Toolkit Intrinsics library (libXt) not found])])
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+   fi
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    AC_SUBST([XT_CFLAGS])
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    AC_SUBST([XT_LIBS])
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 fi