Add 'install-debug' target to buildsystem.

Author: niklasso

Makefile

@@ -167,6 +167,7 @@ $(BUILD_DIR)/dynamic/lib/$(MINISAT_DLIB).$(SOMAJOR).$(SOMINOR)$(SORELEASE)\
 	$(VERB) ln -sf $(MINISAT_DLIB).$(SOMAJOR) $(BUILD_DIR)/dynamic/lib/$(MINISAT_DLIB)
 
 install:	install-headers install-lib install-bin
+install-debug:	install-headers install-lib-debug
 
 install-headers:
 #       Create directories
@@ -179,6 +180,10 @@ install-headers:
 	  $(INSTALL) -m 644 $$h $(DESTDIR)$(includedir)/$$h ; \
 	done
 
+install-lib-debug: $(BUILD_DIR)/debug/lib/$(MINISAT_SLIB)
+	$(INSTALL) -d $(DESTDIR)$(libdir)
+	$(INSTALL) -m 644 $(BUILD_DIR)/debug/lib/$(MINISAT_SLIB) $(DESTDIR)$(libdir)
+
 install-lib: $(BUILD_DIR)/release/lib/$(MINISAT_SLIB) $(BUILD_DIR)/dynamic/lib/$(MINISAT_DLIB).$(SOMAJOR).$(SOMINOR)$(SORELEASE)
 	$(INSTALL) -d $(DESTDIR)$(libdir)
 	$(INSTALL) -m 644 $(BUILD_DIR)/dynamic/lib/$(MINISAT_DLIB).$(SOMAJOR).$(SOMINOR)$(SORELEASE) $(DESTDIR)$(libdir)