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-rw-r--r--mesalib/src/gallium/auxiliary/util/u_math.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/mesalib/src/gallium/auxiliary/util/u_math.h b/mesalib/src/gallium/auxiliary/util/u_math.h
index f908341f6..404bd21e1 100644
--- a/mesalib/src/gallium/auxiliary/util/u_math.h
+++ b/mesalib/src/gallium/auxiliary/util/u_math.h
@@ -51,6 +51,10 @@ extern "C" {
#include <math.h>
#include <stdarg.h>
+#ifdef PIPE_OS_UNIX
+#include <strings.h> /* for ffs */
+#endif
+
#ifndef M_SQRT2
#define M_SQRT2 1.41421356237309504880