Index: src/ipelib/ipeplatform.cpp
--- src/ipelib/ipeplatform.cpp.orig
+++ src/ipelib/ipeplatform.cpp
@@ -49,6 +49,9 @@
 #include <sys/param.h>
 #include <sys/errno.h>
 #endif
+#ifdef __OpenBSD__
+#include <errno.h>
+#endif
 
 #ifdef IPE_GSL
 #include <gsl/gsl_errno.h>
@@ -671,6 +674,8 @@ static double ipestrtod(const char *s, char ** fin)
     return p_strtod_l(s, fin, ipeLocale);
   else
     return strtod(s, fin);
+#elif defined(__OpenBSD__)
+  return strtod(s, fin);
 #else
   return strtod_l(s, fin, ipeLocale);
 #endif