Bug fix: ./configure did not abort if libburn.h or libisofs.h were missing

configure.ac

@@ -345,10 +345,20 @@ fi
 AC_SUBST(LIBBURNIA_LDCONFIG_CMD)
 
 
-
-AC_CHECK_HEADER(libburn/libburn.h)
-AC_CHECK_HEADER(libisofs/libisofs.h)
-
+AC_CHECK_HEADER(libburn/libburn.h, LIBBURNIA_HAVE_LIBBURN=1, LIBBURNIA_HAVE_LIBBURN=0)
+AC_CHECK_HEADER(libisofs/libisofs.h, LIBBURNIA_HAVE_LIBISOFS=1, LIBBURNIA_HAVE_LIBISOFS=0)
+if test x$LIBBURNIA_HAVE_LIBBURN = x0; then
+    echo "FATAL: Lacking libburn development header file <libburn/libburn.h>" 2>&1
+    echo "HINT: You first have to install libburn before you can build libisoburn" 2>&1
+fi
+if test x$LIBBURNIA_HAVE_LIBISOFS = x0; then
+    echo "FATAL: Lacking libisofs development header file <libisofs/libisofs.h>" 2>&1
+    echo "HINT: You first have to install libisofs before you can build libisoburn" 2>&1
+fi
+if test x$LIBBURNIA_HAVE_LIBBURN = x0 -o x$LIBBURNIA_HAVE_LIBISOFS = x0; then
+    echo "ABORT: Lacking mandatory prerequisites" 2>&1
+    exit 1
+fi
 
 # ------- Visible mark in configure : Start of library check
 

xorriso/xorriso_timestamp.h

@@ -1 +1 @@
-#define Xorriso_timestamP "2013.03.13.195851"
+#define Xorriso_timestamP "2013.03.17.110559"