bash-3.00$ cat Makefile 
MODULES=res_cepstral.o

CC=gcc
LD=ld

CPUARCH=$(shell uname -m)

OPT?=-pipe -O6
WARN=-Wall -Wstrict-prototypes -Wno-pointer-sign -Wmissing-prototypes -Wmissing-declarations
DEBUG=-g

SOLINK=-shared -Xlinker -x
STRIP=strip
INSTALL=install
STATIC=-static

ifeq ($(CPUARCH),i686)
ARCHMODE=-m32
endif

ifeq ($(CPUARCH),x86_64)
ARCHMODE=-m64 -fPIC
endif

LDFLAGS+=-L/opt/swift/lib
CFLAGS+=-I/opt/swift/include -Iinclude

LIBCEPSTRAL=-lswift -Wl,-rpath,/opt/swift/lib

CFLAGS+=-Iasterisk/include

all: asterisk/include/asterisk/autoconfig.h asterisk/include/asterisk/buildopts.h res_cepstral.so

clean:
        rm -f *.o *.so

res_cepstral.so: res_cepstral.o
        $(CC) $(ARCHMODE) $(SOLINK) -o $@ $< $(STATIC) $(LIBS) $(LDFLAGS) $(LIBCEPSTRAL)
ifeq ($(DEBUG),)
        $(STRIP) $@
endif

res_cepstral.o: res_cepstral.c
        $(CC) -c -o $@ $< $(ARCHMODE) $(CFLAGS) $(OPT) $(DEBUG) $(WARN) -DAST_MODULE=\"res_cepstral\"

asterisk/include/asterisk/autoconfig.h:
        @cd asterisk && ./configure && cd ..

asterisk/include/asterisk/buildopts.h:
        @cd asterisk && make include/asterisk/buildopts.h && cd ..

install: all
        install -m 644 include/asterisk/saytext.h /usr/include/asterisk/saytext.h
        install -m 755 res_cepstral.so /usr/lib/asterisk/modules/res_cepstral.so