diff --git a/ns/regen_makefile.sh b/ns/regen_makefile.sh
new file mode 100755
index 0000000..fece5d8
--- /dev/null
+++ b/ns/regen_makefile.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+FILES="*.ttcn *.ttcnpp BSSGP_EncDec.cc IPL4asp_PT.cc IPL4asp_discovery.cc TCCConversion.cc TCCInterface.cc UD_PT.cc RLCMAC_EncDec.cc LLC_EncDec.cc TELNETasp_PT.cc Native_FunctionDefs.cc StatsD_CodecPort_CtrlFunctdef.cc "
+
+FILES+="AF_PACKET_PT.cc AF_PACKET_PT.hh "
+
+export CPPFLAGS_TTCN3="-DBSSGP_EM_L3 -DNS_EMULATION_FR"
+
+../regen-makefile.sh NS_Tests.ttcn $FILES