Index: cfox/include/fxmath.h
--- cfox/include/fxmath.h.orig
+++ cfox/include/fxmath.h
@@ -1002,7 +1002,7 @@ static inline FXdouble exp2(FXdouble x){
 
 /// Single precision base 10 exponential
 static inline FXfloat exp10(FXfloat x){
-#if defined(NO_EXP10F)
+#if defined(NO_EXP10F) || defined(__OpenBSD__)
   return Math::pow(10.0f,x);
 #else
   return ::exp10f(x);
@@ -1012,7 +1012,7 @@ static inline FXfloat exp10(FXfloat x){
 
 /// Double precision base 10 exponential
 static inline FXdouble exp10(FXdouble x){
-#if defined(NO_EXP10)
+#if defined(NO_EXP10) || defined(__OpenBSD__)
   return Math::pow(10.0,x);
 #else
   return ::exp10(x);
