$NetBSD: patch-Makefile,v 1.1 2023/01/27 10:30:49 micha Exp $

* Add targets for object file, library, test and install.
* Honor CPPFLAGS, CFLAGS and LDFLAGS
* Use libtool

--- Makefile.orig	2021-07-14 10:28:45.000000000 +0000
+++ Makefile
@@ -1,8 +1,44 @@
-all: sds-test
+# Switch make into POSIX conformant mode (must be the first non-comment line)
+.POSIX:
 
-sds-test: sds.c sds.h testhelp.h
-	$(CC) -o sds-test sds.c -Wall -std=c99 -pedantic -O2 -DSDS_TEST_MAIN
-	@echo ">>> Type ./sds-test to run the sds.c unit tests."
+# Clear suffix list for inference rules
+.SUFFIXES:
+
+# ABI version for shared library
+MAJOR=  2
+MINOR=  2
+PATCH=  0
+
+all: libsds.la
+
+test: sds-test
+	./sds-test
+
+install: libsds.la
+	@set +u ; test "x$$PREFIX" != "x" || \
+            ! echo "Error: PREFIX not defined in environment"
+	install -d -m 755 "${DESTDIR}${PREFIX}/lib"
+	libtool --mode=install \
+            install -m 755 libsds.la "${DESTDIR}${PREFIX}/lib"
+	install -d -m 755 "${DESTDIR}${PREFIX}/include"
+	install -m 644 sds.h "${DESTDIR}${PREFIX}/include"
+	install -d -m 755 "${DESTDIR}${PREFIX}/share/doc/sds"
+	install -m 644 README.md "${DESTDIR}${PREFIX}/share/doc/sds"
 
 clean:
-	rm -f sds-test
+	rm -f sds-test sds.o sds.lo libsds.la
+	rm -rf ./.libs
+
+sds.lo: sds.c sds.h
+	libtool --tag=CC --mode=compile \
+            $(CC) $(CPPFLAGS) $(CFLAGS) -c -Wall -std=c99 -pedantic -O2 sds.c
+
+libsds.la: sds.lo
+	libtool --tag=CC --mode=link \
+            $(CC) $(LDFLAGS) -shared -o libsds.la sds.lo \
+            -version-number ${MAJOR}:${MINOR}:${PATCH} \
+            -rpath ${PREFIX}/lib
+
+sds-test: sds.c sds.h testhelp.h
+	$(CC) $(CPPFLAGS) $(CFLAGS) -Wall -std=c99 -pedantic -O2 \
+            -DSDS_TEST_MAIN -o sds-test sds.c