diff -Naur wmacpi-2.4.orig/Makefile wmacpi-2.4/Makefile
--- wmacpi-2.4.orig/Makefile	2020-05-03 14:30:36.000000000 +0200
+++ wmacpi-2.4/Makefile	2020-06-15 17:32:49.549006100 +0200
@@ -15,8 +15,8 @@
 #OPT	= -pg -g
 
 CC	:= gcc
-CFLAGS	+= $(OPT) -Wall -W -g -ansi -DWMACPI_VER='"$(WMACPI_VER)"'
-LDFLAGS += $(OPT) -lX11 -ldockapp
+CFLAGS	+= -DWMACPI_VER='"$(WMACPI_VER)"'
+LIBS := -lX11 -ldockapp
 
 WMSRC	:= wmacpi.c libacpi.c
 HEADERS := libacpi.h
@@ -28,7 +28,7 @@
 doc_targets += wmacpi-cli.1
 endif
 
-PREFIX := /usr/local
+PREFIX := /usr
 
 all: $(targets)
 
@@ -39,7 +39,7 @@
 -include $(WMOBJ:.o=.d)
 
 wmacpi:	$(WMOBJ)
-	$(CC) -o $@ $^ $(LDFLAGS)
+	$(CC) $(LDFLAGS) -o $@ $^ $(LIBS)
 
 # for the Debian package, we want to make building the command line tools
 # optional. So, we hide all the necessary stuff here . . .
@@ -49,13 +49,13 @@
 -include $(CLOBJ:.o=.d)
 
 wmacpi-cli: $(CLOBJ)
-	$(CC) $(LDFLAGS) -o $@ $^
+	$(CC) $(LDFLAGS) -o $@ $^ $(LIBS)
 endif
 
 # build per-file dependencies - note that -MM may not be supported
 # in gcc versions older than 2.95.4, but most likely is.
 %.d: %.c
-	gcc -MM $(CFLAGS) $< > $@
+	$(CC) -MM $(CFLAGS) $< > $@
 
 clean:
 	rm -f TAGS *.o *~ trace *.out *.bb *.bbg