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-rw-r--r--src/iemlib2/sigm2f.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/iemlib2/sigm2f.c b/src/iemlib2/sigm2f.c
index eb410c6..0309497 100644
--- a/src/iemlib2/sigm2f.c
+++ b/src/iemlib2/sigm2f.c
@@ -13,6 +13,7 @@ iemlib2 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
+#include <math.h>
/* ----------- m2f~ ----------- */
/* --------- obsolete --------- */