ttcn3-bts-test: abort if missing osmo-config-merge

Change-Id: I9cea4affac0b3981c88078581a070f98649da667
---
M ttcn3-bts-test/Makefile
1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/ttcn3-bts-test/Makefile b/ttcn3-bts-test/Makefile
index a6fc200..fc6f3f8 100644
--- a/ttcn3-bts-test/Makefile
+++ b/ttcn3-bts-test/Makefile
@@ -12,8 +12,10 @@
 	oml/osmo-bts.gen.cfg \
 	fh/osmo-bsc.gen.cfg
 
-.PHONY: cfg
-cfg: $(CFG_SRC_FILES) $(CFG_GEN_FILES)
+.PHONY: req-osmo-config-merge cfg
+req-osmo-config-merge:
+	command -v osmo-config-merge
+cfg: req-osmo-config-merge $(CFG_SRC_FILES) $(CFG_GEN_FILES)
 
 # Ensure that we always fetch up-to-date configuration files.
 # See https://www.gnu.org/software/make/manual/make.html#Force-Targets

