When using pkg-config to check for the x11 package compiler flags and
libraries we actually need to retrieve those values from the pc file.
This should also fix the issue with non-canonical installations of the
X11 headers and shared objects.
http://bugzilla.openedhand.com/show_bug.cgi?id=1966
AS_IF([test "x$have_x11" = "xyes"],
[
X11_PC_FILES="x11"
+
+ # we actually need to ask for CFLAGS and LIBS
+ X11_CFLAGS=`$PKG_CONFIG --cflags $X11_PC_FILES`
+ X11_LIBS=`$PKG_CONFIG --libs $X11_PC_FILES`
+
AC_MSG_RESULT([found])
],
[