ports: ncurses, so zsh's line editor has a terminal to drive

zsh's configure will happily build without a terminal library -- the probe is
AC_SEARCH_LIBS, which is soft -- and produce a shell whose cursor cannot move
and whose arrow keys do nothing. ZLE is the reason to want zsh, so this comes
first.

MIT, so it combines with Apache-2.0 without conditions.

Built static, widec (which is what zsh looks for first, and the console's
UTF-8 decoder can already take), and --disable-database --with-fallbacks so
seven terminal descriptions are compiled into the library. SchOS has no
business shipping /usr/share/terminfo, and with the fallbacks the .a is
self-contained: verified that no terminfo path strings survive in the binary.

Nothing reaches sysroot/ -- a static library is not a file the OS ships -- so
`install` means into $(PREFIX). port.mk gains NCURSES beside MUSL for the
same reason MUSL is there.

tinfotest.c is the acceptance test, and asks the question the build cannot:
not "did it link" but "does terminfo work on a SchOS console". It reports
TIOCGWINSZ, initialises from the compiled-in fallback, and names every
capability ZLE binds. Anything MISSING there is a missing feature in the
shell later.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VQ7Qx8E1q1M1bbCq8QLHS2

ports/ncurses/Makefile

@@ -0,0 +1,115 @@
+# SPDX-License-Identifier: Apache-2.0
+# ncurses -- terminal capability database and screen library, MIT:
+# https://invisible-island.net/ncurses/
+#
+# Here because zsh's line editor is the reason to want zsh, and the line editor
+# drives the terminal through tigetstr/tputs. zsh's configure will happily build
+# without a terminal library -- AC_SEARCH_LIBS is soft -- and produce a shell
+# whose cursor cannot move and whose arrow keys do nothing. So this comes first.
+#
+# Unlike every other port, nothing here reaches sysroot/. ncurses is built
+# static and consumed at link time by zsh; `install` means "into $(PREFIX)".
+#
+# The awkward part of ncurses is that it is a library whose data is a database.
+# Normally that database is ~4000 compiled terminal descriptions under
+# /usr/share/terminfo, which SchOS has no business shipping. --disable-database
+# plus --with-fallbacks compiles a chosen handful directly into the library, so
+# the resulting .a is self-contained and the filesystem stays clean.
+
+include ../mk/port.mk
+
+NC_VERSION := 6.4
+NC_URL     := https://ftp.gnu.org/gnu/ncurses/ncurses-$(NC_VERSION).tar.gz
+NC_SHA256  := 6931283d9ac87c5073f30b6290c4c75f21632bb4fc3603ac8100812bed248159
+
+TARBALL := $(DISTDIR)/ncurses-$(NC_VERSION).tar.gz
+
+# The terminal types compiled into the library. `linux` is what SchOS's own
+# console is closest to and what TERM is set to; the rest are here so a serial
+# console or an ssh client from a real machine still gets a working editor.
+# Every name added is bytes in the binary, so this list is deliberately short.
+NC_FALLBACKS := linux,vt100,vt102,xterm,xterm-256color,screen,dumb
+
+# Cross-compiling ncurses needs tic and infocmp *on the host* to turn those
+# names into C. Both exist here; the paths are looked up rather than written
+# down because on NixOS they live in the store and move on every update.
+HOST_TIC     ?= $(shell command -v tic)
+HOST_INFOCMP ?= $(shell command -v infocmp)
+
+# gcc, for the same reason fastfetch uses it: -print-libgcc-file-name.
+HOSTCC_NC ?= gcc
+GCC_INC   := $(shell $(HOSTCC_NC) -print-file-name=include)
+LIBGCC    := $(shell $(HOSTCC_NC) -print-libgcc-file-name)
+
+# Split exactly as autoconf consumes them: it links a test as
+#   $CC $CFLAGS $LDFLAGS conftest.c $LIBS
+# so crt1.o/crti.o must ride in LDFLAGS (before the object) and libc in LIBS
+# (after it). libc twice -- libgcc reaches back into it, and a static link
+# resolves left to right.
+NC_CPPFLAGS := -nostdinc -isystem $(MUSL)/include -isystem $(GCC_INC) -D__SCHOS__
+NC_CFLAGS   := -O2 $(CFLAGS_BT)
+NC_LDFLAGS  := -static -nostdlib -L$(MUSL)/lib $(MUSL)/lib/crt1.o $(MUSL)/lib/crti.o
+NC_LIBS     := $(MUSL)/lib/libc.a $(LIBGCC) $(MUSL)/lib/libc.a $(MUSL)/lib/crtn.o
+
+# ncurses builds make_hash and make_keys to run during the build, not on the
+# target. In a cross build those must be compiled for the host, with the host's
+# own libc -- hence a second, completely separate set of flags.
+NC_BUILD_CC := $(HOSTCC_NC)
+
+NC_CONFIGURE := \
+  --host=x86_64-linux-musl \
+  --build=x86_64-pc-linux-gnu \
+  --prefix=$(PREFIX) \
+  --disable-database \
+  --with-fallbacks=$(NC_FALLBACKS) \
+  --with-tic-path=$(HOST_TIC) \
+  --with-infocmp-path=$(HOST_INFOCMP) \
+  --without-shared --with-normal \
+  --enable-widec \
+  --enable-overwrite \
+  --without-cxx --without-cxx-binding \
+  --without-ada --without-tests --without-progs --without-manpages \
+  --without-debug --without-profile \
+  --disable-stripping \
+  --disable-home-terminfo \
+  --disable-rpath-hack
+
+$(TARBALL): | $(DISTDIR)
+	curl -fsSL -o $@ $(NC_URL)
+	sh $(SHA256CHECK) "$(NC_SHA256)" "$@"
+
+download: $(TARBALL)
+
+$(SRCDIR): $(TARBALL)
+	mkdir -p $(PORTDIR)
+	tar -xzf $< -C $(PORTDIR)
+	mv $(PORTDIR)/ncurses-$(NC_VERSION) $@
+
+extract: $(SRCDIR)
+
+$(BUILDDIR)/config.status: | $(SRCDIR)
+	@test -n "$(HOST_TIC)" -a -n "$(HOST_INFOCMP)" || { \
+	  echo "ncurses: host tic/infocmp not found -- install ncurses on the build host" >&2; \
+	  exit 1; }
+	mkdir -p $(BUILDDIR)
+	cd $(BUILDDIR) && \
+	  CC="$(HOSTCC_NC)" \
+	  CPPFLAGS="$(NC_CPPFLAGS)" \
+	  CFLAGS="$(NC_CFLAGS)" \
+	  LDFLAGS="$(NC_LDFLAGS)" \
+	  LIBS="$(NC_LIBS)" \
+	  BUILD_CC="$(NC_BUILD_CC)" \
+	  BUILD_CPPFLAGS= BUILD_CFLAGS= BUILD_LDFLAGS= BUILD_LIBS= \
+	  $(SRCDIR)/configure $(NC_CONFIGURE)
+
+$(PREFIX)/lib/libncursesw.a: $(BUILDDIR)/config.status
+	$(MAKE) -C $(BUILDDIR)
+	$(MAKE) -C $(BUILDDIR) install
+
+build install: $(PREFIX)/lib/libncursesw.a
+
+clean:
+	rm -rf $(PORTDIR)
+
+distclean: clean
+	rm -f $(TARBALL)