allow build to proceed if either Qt or QScintilla is missing * configure.ac: Instead of aborting the configure script, set build_gui to "no" if Qt is missing. Don't abort configure script if QScintilla is missing. If QScintilla is available, define HAVE_QSCINTILLA. * file-editor-tab.cc, file-editor.cc, find-dialog.cc, lexer-octave-gui.cc: Surround file contents with #ifdef HAVE_QSCINTILLA. * main-window.cc (main_window::~main_window): Skip deletion of _file_editor if HAVE_QSCINTILLA is not defined. (main_window::new_file, main_window::open_file, main_window::focus_editor): Do nothing if HAVE_QSCINTILLA is not defined. (main_window::handle_entered_debug_mode, main_window::handle_quit_debug_mode): Skip operation on _file_editor if HAVE_QSCINTILLA is not defined. (main_window::construct): Skip creation of _file_editor and operations on it if HAVE_QSCINTILLA is not defined. * main-window.h (main_window::_file_editor): Omit data member from class if HAVE_QSCINTILLA is not defined.

--- a/libgui/src/m-editor/lexer-octave-gui.cc	Wed Jan 02 11:31:44 2013 -0500
+++ b/libgui/src/m-editor/lexer-octave-gui.cc	Wed Jan 02 14:29:50 2013 -0500
@@ -24,6 +24,8 @@
 #include <config.h>
 #endif
 
+#ifdef HAVE_QSCINTILLA
+
 #include "lexer-octave-gui.h"
 #include <qcolor.h>
 #include <qfont.h>
@@ -175,3 +177,4 @@
   return 0;
 }
 
+#endif