//namespace lyx {
///About dialog, inset info, export headers
-extern char const * lyx_version;
+extern char const * const lyx_version;
//.lyx header. We don't want lyx_version because of VCS conflicts.
extern const int lyx_version_major;
extern const int lyx_version_minor;
///
-extern char const * lyx_release_date;
+extern char const * const lyx_release_date;
/// Package identifier (lyx[-<version-suffix>])
-extern char const * lyx_package;
+extern char const * const lyx_package;
/// This is the version information shown by 'lyx -version'
-extern char const * lyx_version_info;
+extern char const * const lyx_version_info;
+
+// Do not remove the comment below, so we get merge conflict in
+// independent branches. Instead add your own.
+#define LYX_FORMAT_LYX 474 // rgh: dummy format change for Chunk switch
+#define LYX_FORMAT_TEX2LYX 474
+
+#if LYX_FORMAT_TEX2LYX != LYX_FORMAT_LYX
+#ifndef _MSC_VER
+#warning "tex2lyx produces an out of date file format."
+#warning "Please update tex2lyx as soon as possible, since it depends implicitly"
+#warning "on the current file format in some places (this causes bugs like #7780)."
+#else
+#pragma message("warning: tex2lyx produces an out of date file format. " \
+ "Please update tex2lyx as soon as possible, since it depends implicitly " \
+ "on the current file format in some places (this causes bugs like #7780).")
+#endif
+#endif
//} // namespace lyx