Makefile: Add generic paths to the install commands, so that tools to build...

Makefile: Add generic paths to the install commands, so that tools to build (mostly Debian) package work.

Makefile

 INCLUDE_PYTHON = $(shell pkg-config --cflags python3 | cut -f 1 -d " ")
 
+ifeq ($(PREFIX),)
+	PREFIX := /usr/local
+endif
+
 bin/metadata-collect-agent:
 	#Error expected here (line -g++ ...), writing a C program using the error messages
 	install -d bin/ ;\
@@ -33,12 +37,13 @@ lib/fluentbit_wendelin.so:
 	#installation/plugin-fluentbit/fluentbit_wendelin_install.sh
 
 install-no-dracut:
-	install -d /sbin/
-	install -m 744 bin/metadata-collect-agent /sbin/metadata-collect-agent
-	install -m 744 bin/fluent-bit /sbin/fluent-bit
-	install -d /etc/
-	install -m 644 flb.conf /etc/flb.conf
-	install lib/fluentbit_wendelin.so /etc/fluentbit_wendelin.so
+	install -d $(DESTDIR)$(PREFIX)/bin/
+	install -m 744 bin/metadata-collect-agent $(DESTDIR)$(PREFIX)/bin/metadata-collect-agent
+	install -m 744 bin/fluent-bit $(DESTDIR)$(PREFIX)/bin/fluent-bit
+	install -d $(DESTDIR)$(PREFIX)/etc/
+	install -m 644 flb.conf $(DESTDIR)$(PREFIX)/etc/flb.conf
+	install -d $(DESTDIR)$(PREFIX)/lib
+	install lib/fluentbit_wendelin.so $(DESTDIR)$(PREFIX)/lib/fluentbit_wendelin.so
 
 no-dracut: bin/metadata-collect-agent lib/fluentbit_wendelin.so bin/fluent-bit