Index: src/backend/gsl/parser.y
--- src/backend/gsl/parser.y.orig
+++ src/backend/gsl/parser.y
@@ -355,7 +355,11 @@ int yylex(param *p) {
 #endif
 		double result;
 		if (locale != NULL) {
+#if defined(__OpenBSD__)
+			result = strtod(s, &remain);
+#else
 			result = strtod_l(s, &remain, locale);
+#endif
 			freelocale(locale);
 		} else // use C locale
 			result = strtod(s, &remain);