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-rw-r--r--winsup/cygwin/shm.cc4
1 files changed, 4 insertions, 0 deletions
diff --git a/winsup/cygwin/shm.cc b/winsup/cygwin/shm.cc
index e209346f7..1d3200c36 100644
--- a/winsup/cygwin/shm.cc
+++ b/winsup/cygwin/shm.cc
@@ -21,6 +21,10 @@ details. */
#include "sync.h"
#include "ntdll.h"
+/* __getpagesize is only available from libcygwin.a */
+#undef SHMLBA
+#define SHMLBA (wincap.allocation_granularity ())
+
/*
* client_request_shm Constructors
*/