diff -Naur wmsystray-0.1.1.orig/Makefile wmsystray-0.1.1/Makefile
--- wmsystray-0.1.1.orig/Makefile	2004-03-01 05:35:47.000000000 +0100
+++ wmsystray-0.1.1/Makefile	2020-12-03 11:22:13.786357942 +0100
@@ -1,13 +1,14 @@
 prefix=/usr
 bindir = ${prefix}/bin
 mandir = ${prefix}/share/man
-INSTALL = /bin/install
+INSTALL = install
 INSTALLPROG = ${INSTALL} -m 0755
 INSTALLMAN = ${INSTALL} -m 0644
+EXTRACFLAGS = 
 
 all:
-	make -C xembed xembed.o
-	make -C wmsystray
+	make EXTRACFLAGS="${EXTRACFLAGS}" -C xembed xembed.o
+	make EXTRACFLAGS="${EXTRACFLAGS}" -C wmsystray
 
 clean:
 	make -C xembed clean
diff -Naur wmsystray-0.1.1.orig/wmsystray/Makefile wmsystray-0.1.1/wmsystray/Makefile
--- wmsystray-0.1.1.orig/wmsystray/Makefile	2004-03-01 04:54:44.000000000 +0100
+++ wmsystray-0.1.1/wmsystray/Makefile	2020-12-03 11:26:57.544595661 +0100
@@ -1,14 +1,13 @@
 include ../Rules.make
 
-CC = gcc
-CFLAGS = ${X11CFLAGS} -DTRACE_LEVEL=${TRACE_LEVEL} -I../xembed -Wall -g
+CFLAGS = ${X11CFLAGS} -DTRACE_LEVEL=${TRACE_LEVEL} -I../xembed -g ${EXTRACFLAGS}
 LDFLAGS = ${X11LDFLAGS} -lXpm
 
 OBJS = main.o ui.o systray.o xpms.o
 XEMBED_OBJS = ../xembed/xembed.o
 
 wmsystray: ${OBJS} ${XEMBED_OBJS}
-	gcc ${OBJS} ${XEMBED_OBJS} -o wmsystray ${LDFLAGS}
+	${CC} ${OBJS} ${XEMBED_OBJS} -o wmsystray ${LDFLAGS}
 
 clean:
 	rm -f wmsystray ${OBJS}
diff -Naur wmsystray-0.1.1.orig/xembed/Makefile wmsystray-0.1.1/xembed/Makefile
--- wmsystray-0.1.1.orig/xembed/Makefile	2004-03-01 04:54:44.000000000 +0100
+++ wmsystray-0.1.1/xembed/Makefile	2020-12-03 11:22:13.786357942 +0100
@@ -1,6 +1,6 @@
 include ../Rules.make
 
-CFLAGS = -DTRACE_LEVEL=${TRACE_LEVEL} ${X11CFLAGS} -Wall -g
+CFLAGS = -DTRACE_LEVEL=${TRACE_LEVEL} ${X11CFLAGS} -g ${EXTRACFLAGS}
 LDFLAGS = ${X11LDFLAGS}
 
 all: xembed.o