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-rw-r--r--win/tclWinThrd.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/win/tclWinThrd.c b/win/tclWinThrd.c
index 21d422f..4e53ef5 100644
--- a/win/tclWinThrd.c
+++ b/win/tclWinThrd.c
@@ -17,6 +17,14 @@
#include <io.h>
#include <sys/stat.h>
+/* Workaround for mingw versions which don't provide this in float.h */
+#ifndef _MCW_EM
+# define _MCW_EM 0x0008001F /* Error masks */
+# define _MCW_RC 0x00000300 /* Rounding */
+# define _MCW_PC 0x00030000 /* Precision */
+_CRTIMP unsigned int __cdecl _controlfp (unsigned int unNew, unsigned int unMask);
+#endif
+
/*
* This is the master lock used to serialize access to other
* serialization data structures.