--- configure.ac.orig	2019-02-23 16:30:54 UTC
+++ configure.ac
@@ -616,7 +616,7 @@ case $host in
     #AC_SUBST(OS_MACOS)
     ;;
 
-    *-freebsd1*)
+    *freebsd*)
     AC_MSG_RESULT([FreeBSD-1x])
     ADDITIONAL_CFLAGS="-D_GNU_SOURCE"
     ;;