--- Makefile.orig	2007-12-19 06:30:00.000000000 +1100
+++ Makefile	2023-01-18 14:54:30.000000000 +1100
@@ -117,7 +117,7 @@
 	OS_NAME = "Unix"
 	D_BUILD_ENV	= -DBUILD_ENV_UNIX
 	PCAL		= pcal
-	CC		= /usr/bin/gcc
+	CC		?= /usr/bin/gcc
 	PACK		= compress
 	# PACK		= pack
 	# PACK		= gzip
@@ -279,7 +279,7 @@
 ifeq ($(OS),DJGPP)   # DOS+DJGPP
 	CFLAGS = -Wall -W
 else   # Unix
-	CFLAGS = -O2 -Wall -W
+	CFLAGS += -Wall -Wextra
 endif
 
 $(EXECDIR)/$(PCAL):	$(OBJECTS)
@@ -347,7 +347,7 @@
 	groff -man -Thtml $(DOCDIR)/pcal.man >$(DOCDIR)/pcal-help.html
 	groff -man -Tascii $(DOCDIR)/pcal.man >$(DOCDIR)/pcal-help.txt
 
-install:	$(EXECDIR)/$(PCAL) man
+install:	$(EXECDIR)/$(PCAL)
 	mkdir -p $(DESTDIR)/$(BINDIR)
 	mkdir -p $(DESTDIR)/$(MANDIR)
 	mkdir -p $(DESTDIR)/$(CATDIR)