fix(nemo-speech-cpp): make SentencePiece install portable

The upstream helper uses GNU install -D for license files, which BSD install on Darwin does not support. Rewrite those invocations after checkout and create the destination directory explicitly before building.

Assisted-by: Codex:gpt-5.4

Author: localai-org-maint-bot

backend/go/nemo-speech-cpp/Makefile

@@ -94,6 +94,7 @@ ITN_FST_HEADER=$(ITN_PREFIX)/include/fst/fst.h
 # dependency instead of relying on an undeclared system package.
 SENTENCEPIECE_PREFIX=sources/NeMo-Speech.cpp/.deps/sentencepiece
 SENTENCEPIECE_MARKER=$(SENTENCEPIECE_PREFIX)/lib/libsentencepiece.a
+SENTENCEPIECE_INSTALL_PATCH=sources/NeMo-Speech.cpp/scripts/.localai-portable-install
 
 # Linux's ASR CMake block looks in NEMO_SPEECH_DEPENDENCY_PREFIX directly, but
 # the Apple branch uses generic find_library()/find_path(). Put the same private
@@ -278,7 +279,15 @@ patch-itn-headers:
 
 itn: $(ITN_MARKER)
 
-$(SENTENCEPIECE_MARKER): | sources/NeMo-Speech.cpp
+$(SENTENCEPIECE_INSTALL_PATCH): | sources/NeMo-Speech.cpp
+	# BSD install (Darwin) has no GNU -D option. The destination directory is
+	# created by our recipe below, so the helper only needs portable -m here.
+	sed -i.bak 's/install -Dm0644/install -m 0644/g' sources/NeMo-Speech.cpp/scripts/build_sentencepiece_static.sh
+	rm -f sources/NeMo-Speech.cpp/scripts/build_sentencepiece_static.sh.bak
+	touch $@
+
+$(SENTENCEPIECE_MARKER): $(SENTENCEPIECE_INSTALL_PATCH)
+	install -d $(SENTENCEPIECE_PREFIX)/share/licenses/nemo-speech/third_party/sentencepiece
 	cd sources/NeMo-Speech.cpp && JOBS=$(JOBS) scripts/build_sentencepiece_static.sh
 
 sentencepiece: $(SENTENCEPIECE_MARKER)