add gprs_ns_frgre.h to Makefile.am
diff --git a/openbsc/include/openbsc/Makefile.am b/openbsc/include/openbsc/Makefile.am
index 416e907..0805f05 100644
--- a/openbsc/include/openbsc/Makefile.am
+++ b/openbsc/include/openbsc/Makefile.am
@@ -8,7 +8,8 @@
system_information.h handover.h mgcp_internal.h \
vty.h socket.h \
crc24.h gprs_bssgp.h gprs_llc.h gprs_ns.h gprs_gmm.h \
- gb_proxy.h gprs_sgsn.h gsm_04_08_gprs.h sgsn.h
+ gb_proxy.h gprs_sgsn.h gsm_04_08_gprs.h sgsn.h \
+ gprs_ns_frgre.h
openbsc_HEADERS = gsm_04_08.h meas_rep.h bsc_api.h
openbscdir = $(includedir)/openbsc