diff --git a/configure.ac b/configure.ac
index 6fa0727f..4e0e375d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -339,7 +339,7 @@ if test x$enable_debug != xyes; then
     CFLAGS="-DNDEBUG $CFLAGS"
 else
     if test x$GCC = xyes; then
-        CFLAGS="-g -pedantic -Wall $CFLAGS"
+        CFLAGS="-g -pedantic -Wall -Wextra -Wno-unused-parameter $CFLAGS"
     fi
     CFLAGS="-DDEBUG $CFLAGS"
 fi
diff --git a/xorriso/configure_ac.txt b/xorriso/configure_ac.txt
index 9a7c0391..6714d9d7 100644
--- a/xorriso/configure_ac.txt
+++ b/xorriso/configure_ac.txt
@@ -136,7 +136,7 @@ if test x$enable_debug != xyes; then
     CFLAGS="-DNDEBUG $CFLAGS"
 else
     if test x$GCC = xyes; then
-        CFLAGS="-g -pedantic -Wall $CFLAGS"
+        CFLAGS="-g -pedantic -Wall -Wextra -Wno-unused-parameter $CFLAGS"
     fi
     CFLAGS="-DDEBUG $CFLAGS"
 fi
diff --git a/xorriso/xorriso_timestamp.h b/xorriso/xorriso_timestamp.h
index 54e2a2c2..b4a9f5db 100644
--- a/xorriso/xorriso_timestamp.h
+++ b/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2011.05.20.175842"
+#define Xorriso_timestamP "2011.05.22.143652"