diff --git a/configure.in b/configure.in
index 4efa667b..28a66023 100644
--- a/configure.in
+++ b/configure.in
@@ -37,12 +37,15 @@ case $host in
 *solaris*)
 	AM_CONDITIONAL(COND_NEED_STRCASESTR,true)
 	AM_CONDITIONAL(COND_NEED_STRSEP,true)
-	CPPFLAGS="$CPPFLAGS -DHAVE_SOCKLEN_T"
+	CPPFLAGS="$CPPFLAGS -DNOT_HAVE_SA_LEN -D_XPG4_2 "
+	CPPFLAGS="$CPPFLAGS -D__EXTENSIONS__ -DHAVE_BROKEN_RECVIF_NAME"
 	LDFLAGS="$LDFLAGS -lnsl -lsocket";;	
 *linux*)
-	CPPFLAGS="$CPPFLAGS -DHAVE_SOCKLEN_T";;
+	CPPFLAGS="$CPPFLAGS -DNOT_HAVE_SA_LEN";;
+*openbsd*)
+	CPPFLAGS="$CPPFLAGS -DHAVE_BROKEN_RECVDSTADDR";;
 *darwin*)
-	CPPFLAGS="$CPPFLAGS -no-cpp-precomp -DHAVE_SOCKADDR_SA_LEN -DHAVE_SOCKLEN_T -DMAC"
+	CPPFLAGS="$CPPFLAGS -no-cpp-precomp -DMAC"
 	LDFLAGS="$LDFLAGS -framework CoreFoundation"	
 
 	AM_CONDITIONAL(COND_REND_OSX,true)