feat: add Makefile.macos for macOS builds

Uses Homebrew's curl include/lib paths via brew --prefix, supporting
both Apple Silicon and Intel Macs.

Author: br3akzero

Makefile.macos

@@ -0,0 +1,31 @@
+#   Copyright (C) 2024 John Törnblom
+#
+# This file is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; see the file COPYING. If not see
+# <http://www.gnu.org/licenses/>.
+
+BREW_PREFIX := $(shell brew --prefix)
+CURL_PREFIX := $(BREW_PREFIX)/opt/curl
+
+CFLAGS := -O2 -Wall -Werror -I$(CURL_PREFIX)/include
+LDFLAGS := -L$(CURL_PREFIX)/lib
+LDADD  := -lcurl
+
+ELF := fetchpkg
+all: $(ELF)
+
+$(ELF): main.c dl.c parson.c sha256.c sha1.c
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LDADD)
+
+clean:
+	rm -f $(ELF)