Added installation rules

Makefile

@@ -22,3 +22,5 @@ dist: distclean
 		src/Makefile \
 		project.conf \
 		Makefile
+install: all
+	@for i in $(SUBDIRS); do (cd $$i && $(MAKE) install) || exit; done

src/Makefile

@@ -1,4 +1,7 @@
 TARGETS	= libGToolkit.a libGToolkit.so
+PREFIX	= /usr/local
+DESTDIR	=
+LIBDIR	= $(PREFIX)/lib
 CC	= cc
 CFLAGSF	= -W -Wall -ansi
 CFLAGS	= -g
@@ -6,6 +9,8 @@ AR	= ar rc
 RANLIB	= ranlib
 LD	= ld -shared
 RM	= rm -f
+MKDIR	= mkdir -p
+INSTALL	= install
 
 
 all: $(TARGETS)
@@ -26,3 +31,7 @@ clean:
 
 distclean: clean
 	$(RM) $(TARGETS)
+install: all
+	$(MKDIR) $(DESTDIR)$(LIBDIR)
+	$(INSTALL) -m 0644 libGToolkit.a $(DESTDIR)$(LIBDIR)/libGToolkit.a
+	$(INSTALL) -m 0755 libGToolkit.so $(DESTDIR)$(LIBDIR)/libGToolkit.so