diff options
| -rw-r--r-- | libs/pbd/pbd/signals.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/libs/pbd/pbd/signals.h b/libs/pbd/pbd/signals.h index 97cfa65300..42727b7adc 100644 --- a/libs/pbd/pbd/signals.h +++ b/libs/pbd/pbd/signals.h @@ -20,6 +20,8 @@ #ifndef __pbd_signals_h__ #define __pbd_signals_h__ +#include <csignal> + #include <list> #include <map> @@ -67,7 +69,7 @@ public: #endif protected: - Glib::Threads::Mutex _mutex; + mutable Glib::Threads::Mutex _mutex; #ifdef DEBUG_PBD_SIGNAL_CONNECTIONS bool _debug_connection; #endif |