Support POSIX make(1) as build system

.gitignore

@@ -1,3 +1,3 @@
 *.o
 *.obj
-
+*.a

Makefile

@@ -0,0 +1,25 @@
+# Copyright 2020 Xavier Del Campo Romero
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+.POSIX:
+
+PROJECT = libdynstr.a
+CFLAGS = -Iinclude
+DEPS = \
+	dynstr.o
+
+all: $(PROJECT)
+
+$(PROJECT): $(DEPS)
+	$(AR) $(ARFLAGS) $@ $(DEPS)