diff --git a/block-raw.c b/block-raw.c
index 9f4a0a1d2a..9fe953c303 100644
--- a/block-raw.c
+++ b/block-raw.c
@@ -44,6 +44,8 @@
 #endif
 
 #ifdef __sun__
+#define _POSIX_PTHREAD_SEMANTICS 1
+#include <signal.h>
 #include <sys/dkio.h>
 #endif
 #ifdef __linux__
diff --git a/vl.h b/vl.h
index b63145e352..9d95494a0e 100644
--- a/vl.h
+++ b/vl.h
@@ -45,6 +45,10 @@
 #define O_BINARY 0
 #endif
 
+#ifdef __sun__
+#define ENOMEDIUM 4097
+#endif
+
 #ifdef _WIN32
 #include <windows.h>
 #define fsync _commit