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-rw-r--r--src/iemmatrix.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/iemmatrix.h b/src/iemmatrix.h
index 34b15e3..d9abb37 100644
--- a/src/iemmatrix.h
+++ b/src/iemmatrix.h
@@ -66,6 +66,7 @@
# define fabsf fabs
# define sqrtf sqrt
# define powf pow
+# define atanf atan
#endif
#ifdef __APPLE__