diff --git a/lib/Makefile b/lib/Makefile
index 3e21c1b..2d9c8f3 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -118,12 +118,7 @@ else
 INSTALL ?= install
 endif
 
-ifneq (,$(filter $(shell uname),OpenBSD FreeBSD NetBSD DragonFly SunOS))
-PREFIX  ?= /usr
-else
-PREFIX  ?= /usr/local
-endif
-
+PREFIX     ?= /usr/local
 DESTDIR    ?=
 LIBDIR     ?= $(PREFIX)/lib
 INCLUDEDIR ?= $(PREFIX)/include
diff --git a/programs/Makefile b/programs/Makefile
index 07bec03..060ce21 100644
--- a/programs/Makefile
+++ b/programs/Makefile
@@ -126,15 +126,15 @@ else
 INSTALL ?= install
 endif
 
-ifneq (,$(filter $(shell uname),OpenBSD FreeBSD NetBSD DragonFly SunOS))
-PREFIX  ?= /usr
-else
 PREFIX  ?= /usr/local
-endif
-
 DESTDIR ?=
 BINDIR  ?= $(PREFIX)/bin
+
+ifneq (,$(filter $(shell uname),OpenBSD FreeBSD NetBSD DragonFly SunOS))
+MANDIR  ?= $(PREFIX)/man/man1
+else
 MANDIR  ?= $(PREFIX)/share/man/man1
+endif
 
 INSTALL_PROGRAM ?= $(INSTALL) -m 755
 INSTALL_SCRIPT  ?= $(INSTALL) -m 755