Set $HOME/track as default tracking directory

Makefile

@@ -7,7 +7,7 @@ LDFLAGS := -lreadline
 
 PREFIX ?= /usr/local
 USER_NAME ?= $(USER)
-TRACKING_DIR ?= /home/$(USER)/track
+TRACKING_DIR ?= $(HOME)/track
 
 BIN_PATH := bin
 SRC_PATH := src
@@ -43,6 +43,7 @@ install: all
 uninstall:
 	rm -rf $(PREFIX)/bin/tt
 	rm -rf $(PREFIX)/etc/tt.conf
+	@echo "tt has been uninstalled from $(PREFIX). The tracking data in $(TRACKING_DIR) has not been deleted."
 
 clean:
 	rm -rf $(SRC_PATH)/*.o

README.md

@@ -23,7 +23,7 @@ The following variables can be used to configure the build:
 * `CXX` - C++ compiler, defaults to `g++`
 * `PREFIX` - install prefix, defaults to `/usr/local`
 * `USER_NAME` - user name to be mentioned in monthly reports, defaults to `$USER`
-* `TRACKING_DIR` - directory where tracking files are saved, defaults to `/home/$USER/track`
+* `TRACKING_DIR` - directory where tracking files are saved, defaults to `$HOME/track`
 
 The user name and tracking directory can also be set after installation by modifying `$PREFIX/etc/tt.conf`
 
@@ -34,8 +34,6 @@ USER_NAME="<Your full name>" make
 sudo make install
 ~~~~
 
-Note that there is no `/home` directory on macOS. You may want to set `TRACKING_DIR=/Users/$USER/track`.
-
 ## Settings
 The file `$PREFIX/etc/tt.conf` has the format `key=value` and contains the following settings:
 * `user_name` - user name to be mentioned in monthly reports