Added {Free,Open}BSD support | minor edits

Makefile

@@ -1,7 +1,12 @@
-PREFIX  ?= /usr/local
-CC      ?= cc
-CFLAGS  = -pedantic -Wall -Wno-deprecated-declarations -Os
-LDFLAGS = -lX11
+PREFIX  := /usr/local
+CC      := cc
+CFLAGS  := -pedantic -Wall -Wno-deprecated-declarations -Os
+LDFLAGS := -lX11
+
+# FreeBSD (uncomment)
+#LDFLAGS += -L/usr/local/lib -I/usr/local/include
+# # OpenBSD (uncomment)
+#LDFLAGS += -L/usr/X11R6/lib -I/usr/X11R6/include
 
 all: options dwmblocks
 
@@ -18,7 +23,7 @@ blocks.h:
 	cp blocks.def.h $@
 
 clean:
-	${RM} *.o *.gch dwmblocks
+	rm -f *.o *.gch dwmblocks
 
 install: dwmblocks
 	mkdir -p ${DESTDIR}${PREFIX}/bin
@@ -26,6 +31,6 @@ install: dwmblocks
 	chmod 755 ${DESTDIR}${PREFIX}/bin/dwmblocks
 
 uninstall:
-	${RM} ${DESTDIR}${PREFIX}/bin/dwmblocks
+	rm -f ${DESTDIR}${PREFIX}/bin/dwmblocks
 
 .PHONY: all options clean install uninstall