From fe8d50639af71c7e7f8ffec1a8568180e5338a51 Mon Sep 17 00:00:00 2001
From: Bryce Kwon <bryce@brycekwon.com>
Date: Sat, 31 Oct 2026 15:13:30 -0700
Subject: Fetch and check git with what the system has

---
 Makefile | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/Makefile b/Makefile
index 7d38fde..4b3b59c 100644
--- a/Makefile
+++ b/Makefile
@@ -134,14 +134,25 @@ cleanall: clean
 	@if test -e $(GITDIR)/Makefile; then $(MAKE) -C $(GITDIR) clean; fi
 
 # The tarball is checked against its sum before anything is unpacked from it.
-# An older macOS has no sha256sum, but its shasum reads the same format.
+# Each system ships its own fetcher and sum tool (curl or wget on Linux and
+# macOS, fetch on FreeBSD, ftp on OpenBSD and NetBSD, sha256 on the BSDs), so
+# the first one present is used, and xz is piped to tar for a tar that cannot
+# read it, as OpenBSD's cannot.
 .PHONY: get-git
 get-git:
 	mkdir -p $(dir $(GITDIR))
-	curl -fL -o $(GIT_TARBALL) $(GIT_URL)
-	@if command -v sha256sum >/dev/null; then sum=sha256sum; else sum='shasum -a 256'; fi; \
-	echo '$(GIT_SHA256)  $(GIT_TARBALL)' | $$sum -c - || { $(RM) $(GIT_TARBALL); exit 1; }
-	tar -xJf $(GIT_TARBALL) && rm -rf $(GITDIR) && mv git-$(GIT_VERSION) $(GITDIR)
+	@if command -v curl >/dev/null; then curl -fL -o $(GIT_TARBALL) $(GIT_URL); \
+	elif command -v wget >/dev/null; then wget -O $(GIT_TARBALL) $(GIT_URL); \
+	elif command -v fetch >/dev/null; then fetch -o $(GIT_TARBALL) $(GIT_URL); \
+	else ftp -o $(GIT_TARBALL) $(GIT_URL); fi
+	@if command -v sha256sum >/dev/null; then sum=$$(sha256sum $(GIT_TARBALL)); \
+	elif command -v shasum >/dev/null; then sum=$$(shasum -a 256 $(GIT_TARBALL)); \
+	elif command -v sha256 >/dev/null; then sum=$$(sha256 -q $(GIT_TARBALL)); \
+	else sum=$$(openssl dgst -sha256 -r $(GIT_TARBALL)); fi; \
+	test "$${sum%% *}" = '$(GIT_SHA256)' || \
+		{ echo 'get-git: $(GIT_TARBALL) does not match its sum' >&2; $(RM) $(GIT_TARBALL); exit 1; }
+	@if command -v xz >/dev/null; then xz -dc $(GIT_TARBALL) | tar -xf -; else tar -xJf $(GIT_TARBALL); fi
+	rm -rf $(GITDIR) && mv git-$(GIT_VERSION) $(GITDIR)
 	$(RM) $(GIT_TARBALL)
 
 .PHONY: tags
-- 
cgit