From 4a11b530c517538918459c0df5842f8d9afa7607 Mon Sep 17 00:00:00 2001
From: KatolaZ <katolaz@freaknet.org>
Date: Thu, 6 Oct 2022 13:55:55 +0100
Subject: add LICENSE and Makefile

---
 LICENSE   | 15 +++++++++++++++
 Makefile  | 25 +++++++++++++++++++++++++
 README.md |  4 ++++
 3 files changed, 44 insertions(+)
 create mode 100644 LICENSE
 create mode 100644 Makefile

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..66c6382
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,15 @@
+ISC License
+
+Copyright (c) 2020 Vincenzo "KatolaZ" Nicosia <katolaz@freaknet.org>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..fa58aa4
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,25 @@
+# gridcal - compute great-circle distance between two grid locators 
+.POSIX:
+
+SRC = gridcal.c 
+OBJ = ${SRC:.c=.o}
+
+all: options gridcal 
+
+options:
+	@echo "-+- build options -+-"
+	@echo "PREFIX  = ${PREFIX}"
+	@echo "CFLAGS  = ${CFLAGS}"
+	@echo "LDFLAGS = ${LDFLAGS}"
+	@echo "CC      = ${CC}"
+	@echo "-+-+-+-+-+-+-+-+-+-+-" 
+
+gridcal: ${OBJ}
+	$(CC) $(LDFLAGS) -o $@ $(OBJ) -lm
+
+debug: clean
+	${MAKE} CFLAGS="${DEBUG}" all
+
+clean:
+	rm -f gridcal ${OBJ}
+
diff --git a/README.md b/README.md
index 6315c3e..af7d4da 100644
--- a/README.md
+++ b/README.md
@@ -38,4 +38,8 @@ Dependencies
 
 `gridcal` is written in ANSI C has no dependencies.
  
+License
+=======
 
+`gridcal` is free software. It can be used, modified, distributed under
+the terms of the ISC License. See the file LICENSE for more information.
-- 
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