--- a/GNUmakefile
+++ b/GNUmakefile
@@ -18,7 +18,7 @@
 # typically employed by package developers.
 
 
-CC= gcc
+CC?= gcc
 CFLAGS+= -Wall -Wno-address-of-packed-member -Wno-missing-braces
 LDFLAGS+= -lpcap -lm
 
@@ -35,16 +35,16 @@
 	endif
 else
 	ifndef MANPREFIX
-		MANPREFIX=/usr/share
+		MANPREFIX=$(PREFIX)/share
 	endif
 endif
 
 
-ETCPATH= $(DESTDIR)/etc
+ETCPATH= $(DESTDIR)$(PREFIX)/etc
 MANPATH= $(DESTDIR)$(MANPREFIX)/man
 DATAPATH= $(DESTDIR)$(PREFIX)/share/ipv6toolkit
 BINPATH= $(DESTDIR)$(PREFIX)/bin
-SBINPATH= $(DESTDIR)$(PREFIX)/sbin
+SBINPATH= $(DESTDIR)$(PREFIX)/bin
 SRCPATH= tools