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This is just a basic starting point for compiling a C project.

TARGET = theapp
SOURCES = $(wildcard *.c)
OBJECTS = $(subst .c$,.o,$(SOURCES))
HEADERS = $(wildcard *.h)
CC = gcc
LINK = gcc
STRIP = strip

$(TARGET): .depend $(OBJECTS)
        echo "#define BUILD_HOST \"`hostname -f`\"" > build_host.h
        $(LINK) $(LFLAGS) -o $(TARGET) $(OBJECTS) $(LIBPATH) $(LIBS)
        $(STRIP) $(TARGET)

.c.o: $*.h common.h
        $(CC) -c $(CFLAGS) $(DEBUGFLAGS) $(INCPATH) -o $@ $<

-include .depend

        echo "#define BUILD_HOST \"`hostname -f`\"" > build_host.h

        -rm -f .depend
        -rm -f $(OBJECTS)
        -rm -f *~ core *.core
        -rm -f version.h
        -rm -f $(TARGET)

.depend: Makefile $(SOURCES) $(HEADERS)
        @if [ ! -f .depend ]; then touch .depend; fi
        @makedepend -Y -f .depend  $(SOURCES) 2>/dev/null

        echo $(OBJECTS)

How to use build_host.h and generate a version message:

#include "build_host.h"		// created by Makefile

void print_version()
	printf("This is Thingamajig version " VERSION
	       " built " __DATE__ " " __TIME__ " on " BUILD_HOST);

How to do arbitrary conversions with implicit rules:

LOGS = $(wildcard *.log)
LOGPDFS = $(subst .log$,.pdf,$(LOGS))

all: $(LOGPDFS)

%.pdf : %.log
        process-log $<
        mv output.pdf $@