empty=
space=$(empty) $(empty)

## Operating system specification:
# linux - Linux (1.3.37)
# amiga - Amiga (customized 40.62)
OS_NAME=linux

## C compiler specification:
# gcc  - GCC (2.7.0)
# sasc - SAS/C (6.55)
CC_NAME=gcc

## Windowing system specification:
# x11   - X Window System, Version 11(tm) (Release 6, Implementation: XFree 3.1.2)
# amiga - Amiga native windowing system (customized 40.62)
# svga  - svgalib - low level gfx (1.2.8) - only for Linux, as far as I know
# none  - Without any graphics support
WS_NAME=x11

###

ifndef WS_NAME
WS_NAME=none
endif

###

ifeq "$(CC_NAME)" "gcc" # C compiler: GCC
CC_CFLAGS=-Wall -O6 -fomit-frame-pointer -finline-functions -fexpensive-optimizations #-ansi -pedantic
CC_LDFLAGS=-lm -s
DEFKWD=-D
LDTO=-o
LDTOO=-c -o
endif

ifeq "$(CC_NAME)" "sasc" # C compiler: SAS/C
CC_CFLAGS=
CC_LDFLAGS=LINK
DEFKWD=DEF$(space)
LDTO=PNAME
LDTOO=OBJNAME
endif

###

ifeq "$(OS_NAME)" "linux" # Operating system: Linux
OS_CFLAGS=$(DEFKWD)_BSD_SOURCE $(DEFKWD)HAVE_RINT
OS_LDFLAGS=
CP=cp
RM=rm -f
endif

ifeq "$(OS_NAME)" "amiga" # Operating system: Amiga
OS_CFLAGS=
OS_LDFLAGS=
CP=copy
RM=delete >NIL:
endif

###

ifeq "$(WS_NAME)" "x11" # Windowing system: X Window System, Version 11(tm)
WS_CFLAGS=$(DEFKWD)FOR_X11
WS_LDFLAGS=-L/usr/X11/lib -lX11 -lXext -lXpm
WS_LIBSUFF=X11
endif

ifeq "$(WS_NAME)" "amiga" # Windowing system: Amiga native windowing system
WS_CFLAGS=$(DEFKWD)FOR_AMIGA
WS_LDFLAGS=
WS_LIBSUFF=Amiga
endif

ifeq "$(WS_NAME)" "svga" # Windowing system: svgalib - low level gfx
WS_CFLAGS=$(DEFKWD)FOR_SVGA
WS_LDFLAGS=-lvga
WS_LIBSUFF=SVGA
endif

ifeq "$(WS_NAME)" "none" # Windowing system: Without any graphics support
WS_CFLAGS=$(DEFKWD)FOR_NONE
WS_LDFLAGS=
WS_LIBSUFF=none
endif

###

CFLAGS=$(OS_CFLAGS) $(CC_CFLAGS) $(WS_CFLAGS)
LDFLAGS=$(OS_LDFLAGS) $(CC_LDFLAGS) $(WS_LDFLAGS)
WLLIB=wllib-$(WS_LIBSUFF).c

TARGETS=mop451 mop453  ## Examples-related

.PHONY: all clean
all: Makefile $(TARGETS)

clean: 
	-$(RM) $(TARGETS) *.o *.lnk *.npg gmk2mk

distclean: clean
	-$(RM) Makefile

# Compatibility-related
#######################
gmk2mk: gmk2mk.c
	$(CC) $(CFLAGS) $(LDFLAGS) $(LDTO) $@ $<

Makefile: GNUmakefile gmk2mk
	gmk2mk <GNUmakefile >Makefile

# Examples-related
##################
mop451: mop451.o wllib.o
	$(CC) $(LDFLAGS) $(LDTO) $@ $< wllib.o

mop451.o: mop451.c mop451.xpm dyna-add.c wllib.h
	$(CC) $(CFLAGS) $(LDTOO) $@ $<

mop453: mop453.o wllib.o
	$(CC) $(LDFLAGS) $(LDTO) $@ $< wllib.o

mop453.o: mop453.c mop453.xpm dyna-add.c wllib.h
	$(CC) $(CFLAGS) $(LDTOO) $@ $<

wllib.o: $(WLLIB) wllib.h
	$(CC) $(CFLAGS) $(LDTOO) $@ $<