Add install target to Makefile

Bug: #97

Makefile

@@ -1,4 +1,28 @@
-all: sds-test
+LIBVERSION = 2.0.0
+
+SDS_SRC = sds.c sds.h sdsalloc.h
+
+PREFIX ?= /usr/local
+INCLUDE_PATH ?= include/sds
+LIBRARY_PATH ?= lib
+
+INSTALL_INCLUDE_PATH = $(DESTDIR)$(PREFIX)/$(INCLUDE_PATH)
+INSTALL_LIBRARY_PATH = $(DESTDIR)$(PREFIX)/$(LIBRARY_PATH)
+
+INSTALL ?= cp -a
+
+.PHONY: all
+
+all: sds-test sds-install
+
+sds-install: sds-lib
+        mkdir -p $(INSTALL_INCLUDE_PATH) $(INSTALL_LIBRARY_PATH)
+        $(INSTALL) libsds.so.$(LIBVERSION) $(INSTALL_LIBRARY_PATH)
+        $(INSTALL) sds.h $(INSTALL_INCLUDE_PATH)
+
+sds-lib: sds.c sds.h sdsalloc.h
+        $(CC) -fPIC -fstack-protector -std=c99 -pedantic -Wall -Werror -shared \
+                -o libsds.so.$(LIBVERSION) -Wl,-soname=libsds.so.$(LIBVERSION) $(SDS_SRC)
 
 sds-test: sds.c sds.h testhelp.h
 	$(CC) -o sds-test sds.c -Wall -std=c99 -pedantic -O2 -DSDS_TEST_MAIN