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--- a/src/mk/SunOS
+++ b/src/mk/SunOS
@@ -1,7 +1,8 @@
 include $(depth)/mk/commondefs
 include $(depth)/mk/localdefs
 
-ALL_CXXFLAGS = $(CXXFLAGS) $(COMMONCXXFLAGS) $(LOCALCXXFLAGS) 
+ALL_CXXFLAGS = $(CXXFLAGS) $(COMMONCXXFLAGS) $(LOCALCXXFLAGS)  \
+	     -DSTATFS_INCLUDE="<sys/statvfs.h>"
 
 CC = gcc
 CXX = g++