diff --git a/config.mk b/config.mk
index 1d32307..3527fee 100644
--- a/config.mk
+++ b/config.mk
@@ -2,7 +2,7 @@
 VERSION = 0.3
 
 # paths
-PREFIX = /usr/local
+PREFIX ?= /usr/local
 MANPREFIX = ${PREFIX}/share/man
 
 X11INC = /usr/X11R6/include
@@ -14,8 +14,8 @@ LIBS = -L${X11LIB} -lX11
 
 # flags
 CPPFLAGS = -DVERSION=\"${VERSION}\"
-CFLAGS   = -ansi -pedantic -Wall -Os ${INCS} ${CPPFLAGS}
-LDFLAGS  = -s ${LIBS}
+CFLAGS   = ${RPM_OPT_FLAGS} ${INCS} ${CPPFLAGS}
+LDFLAGS += ${LIBS}
 
 # compiler and linker
 CC = cc