--- a/config.mk
+++ b/config.mk
@@ -5,8 +5,8 @@
 PREFIX = /usr/local
 MANPREFIX = ${PREFIX}/share/man
 
-X11INC = /usr/X11R6/include
-X11LIB = /usr/X11R6/lib
+X11INC = -I/usr/X11R6/include
+X11LIB = -L/usr/X11R6/lib
 
 # Xinerama, comment if you don't want it
 XINERAMALIBS  = -lXinerama
@@ -14,18 +14,18 @@
 
 # freetype
 FREETYPELIBS = -lfontconfig -lXft
-FREETYPEINC = /usr/include/freetype2
+FREETYPEINC = -I/usr/include/freetype2
 # OpenBSD (uncomment)
 FREETYPEINC = ${X11INC}/freetype2
 
 # includes and libs
-INCS = -I${X11INC} -I${FREETYPEINC}
-LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS} ${FREETYPELIBS}
+INCS = ${X11INC} ${FREETYPEINC}
+LIBS = ${X11LIB} -lX11 ${XINERAMALIBS} ${FREETYPELIBS}
 
 # flags
-CPPFLAGS = -D_BSD_SOURCE -D_XOPEN_SOURCE=700 -D_POSIX_C_SOURCE=200809L -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
-CFLAGS   = -std=c99 -pedantic -Wall -Os ${INCS} ${CPPFLAGS}
-LDFLAGS  = -s ${LIBS}
+CPPFLAGS += -D_BSD_SOURCE -D_XOPEN_SOURCE=700 -D_POSIX_C_SOURCE=200809L -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
+CFLAGS   += -ansi -pedantic -Wall $(INCS) $(CPPFLAGS)
+LDFLAGS  += ${LIBS}
 
 # compiler and linker
 CC = cc