https://bugs.gentoo.org/69344
https://sourceforge.net/p/cdrdao/patches/26/

patch by qbt937@gmail.com

--- a/dao/CdrDriver.cc
+++ b/dao/CdrDriver.cc
@@ -495,7 +495,7 @@
   0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0
 };
 
-char CdrDriver::REMOTE_MSG_SYNC_[4] = { 0xff, 0x00, 0xff, 0x00 };
+unsigned char CdrDriver::REMOTE_MSG_SYNC_[4] = { 0xff, 0x00, 0xff, 0x00 };
 
 
 /* Maps a string to the corresponding driver option value 
--- a/dao/CdrDriver.h
+++ b/dao/CdrDriver.h
@@ -440,7 +440,7 @@
   bool fullBurn_;
 
   static unsigned char syncPattern[12];
-  static char REMOTE_MSG_SYNC_[4];
+  unsigned static char REMOTE_MSG_SYNC_[4];
 
   static int speed2Mult(int);
   static int mult2Speed(int);
--- a/xdao/CdDevice.cc
+++ b/xdao/CdDevice.cc
@@ -255,10 +255,10 @@
 
 bool CdDevice::updateProgress(Glib::IOCondition cond, int fd)
 {
-  static char msgSync[4] = { 0xff, 0x00, 0xff, 0x00 };
+  unsigned static char msgSync[4] = { 0xff, 0x00, 0xff, 0x00 };
   fd_set fds;
   int state = 0;
-  char buf[10];
+  unsigned char buf[10];
   struct timeval timeout = { 0, 0 };
 
   if (process_ == NULL)