log2 does not exist in math.h on freebsd

diff --git a/src/nse/gnunet-service-nse.c b/src/nse/gnunet-service-nse.c
index b0d635be6a7de51b855b0551ea17ecf7a635899a..543e4794aed97b8807bb19cc999bd0f70cc4f29e 100644 (file)
--- a/src/nse/gnunet-service-nse.c
+++ b/src/nse/gnunet-service-nse.c
@@ -76,6 +76,10 @@
  */
 #define NSE_PRIORITY 5
 
+#if FREEBSD
+#define log2(a) (log(a)/log(2))
+#endif
+
 /**
  * Amount of work required (W-bit collisions) for NSE proofs, in collision-bits.
  */