fix(nemo-speech-cpp): support macOS tools

Homebrew CMake 4 rejects SentencePiece's old policy floor. The pinned helper also uses GNU install's unsupported -D option on macOS.

Set CMake's supported policy floor and make the license install portable before the helper runs on Darwin.

Assisted-by: Codex:gpt-5.4 [Codex CLI]

Author: localai-org-maint-bot

backend/go/nemo-speech-cpp/Makefile

@@ -279,6 +279,17 @@ patch-itn-headers:
 itn: $(ITN_MARKER)
 
 $(SENTENCEPIECE_MARKER): | sources/NeMo-Speech.cpp
+	# The pinned helper uses GNU install's -D option, which BSD install on macOS
+	# does not support. Create the directory explicitly and keep the helper's
+	# four license installs otherwise unchanged. Homebrew CMake 4 also rejects
+	# SentencePiece's old policy floor, so select the oldest supported floor.
+ifeq ($(shell uname -s),Darwin)
+	mkdir -p $(SENTENCEPIECE_PREFIX)/share/licenses/nemo-speech/third_party/sentencepiece
+	sed -i.bak \
+		-e 's/install -Dm0644/install -m 0644/' \
+		-e 's/-DCMAKE_BUILD_TYPE=Release \\/-DCMAKE_BUILD_TYPE=Release -DCMAKE_POLICY_VERSION_MINIMUM=3.5 \\/' \
+		sources/NeMo-Speech.cpp/scripts/build_sentencepiece_static.sh
+endif
 	cd sources/NeMo-Speech.cpp && JOBS=$(JOBS) scripts/build_sentencepiece_static.sh
 
 sentencepiece: $(SENTENCEPIECE_MARKER)