Make installation locations more configurable

This might be desired when platform has its own, custom layout (eg. OpenBSD or
Solaris), or when user wants to install the program to his home directory.

2 files changed, 12 insertions, 3 deletions

diff --git a/Makefile b/Makefile
index f002847..fb3d07e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,9 @@
 .PHONY: clean check install uninstall
 
 PREFIX ?= /usr
+BINPREFIX ?= $(PREFIX)/bin
+MANPREFIX ?= $(PREFIX)/share/man
+DATAPREFIX ?= $(PREFIX)/share
 
 CFLAGS ?= -W -Wall -Wpedantic
 CFLAGS += -std=gnu11 $(shell sdl2-config --cflags)
@@ -41,9 +44,9 @@ clean:
 	@$(RM) $(TARGET) $(OBJECTS) $(TESTS)
 
 install: $(TARGET)
-	install -D -m 0755 $(TARGET) $(DESTDIR)$(PREFIX)/bin/imv
-	install -D -m 0644 doc/imv.1 $(DESTDIR)$(PREFIX)/share/man/man1/imv.1
-	install -D -m 0644 files/imv.desktop $(DESTDIR)$(PREFIX)/share/applications/imv.desktop
+	install -D -m 0755 $(TARGET) $(DESTDIR)$(BINPREFIX)/imv
+	install -D -m 0644 doc/imv.1 $(DESTDIR)$(MANPREFIX)/man1/imv.1
+	install -D -m 0644 files/imv.desktop $(DESTDIR)$(DATAPREFIX)/applications/imv.desktop
 
 uninstall:
 	$(RM) $(DESTDIR)$(PREFIX)/bin/imv
diff --git a/README.md b/README.md
index 2a08f31..5c9c87b 100644
--- a/README.md
+++ b/README.md
@@ -64,6 +64,12 @@ Installation
     $ make
     # make install
 
+Macro `PREFIX` controls installation prefix.  If more control over installation
+paths is required, macros `BINPREFIX`, `MANPREFIX` and `DATAPREFIX` are
+available.  Eg. to install `imv` to home directory, run:
+
+    $ BINPREFIX=~/bin PREFIX=~/.local make install
+
 Tests
 -----