diff -ur jbigkit.orig/libjbig/Makefile jbigkit/libjbig/Makefile
--- jbigkit.orig/libjbig/Makefile	2008-08-30 20:20:52.000000000 +0300
+++ jbigkit/libjbig/Makefile	2010-02-28 13:12:41.000000000 +0200
@@ -1,29 +1,55 @@
 # Unix makefile for the JBIG-KIT library
 # $Id: jbigkit-2.0-r1-build.patch,v 1.1 2010/03/15 19:55:43 grobian Exp $
 
-# Select an ANSI/ISO C compiler here, GNU gcc is recommended
-CC = gcc
+AR ?= ar
+CC ?= gcc
+RANLIB ?= ranlib
+
+CFLAGS += -Wall -ansi -pedantic
+
+ifeq ($(shell uname),Darwin)
+	SONAME = dylib
+	LIBDIR ?= /usr/lib
+else
+	SONAME = so
+endif
 
-# Options for the compiler: A high optimization level is suggested
-CFLAGS = -g -O -Wall -ansi -pedantic # --coverage
-
-all: libjbig.a tstcodec tstcodec85
+all: libjbig.a libjbig.$(SONAME) libjbig85.a libjbig85.$(SONAME) tstcodec tstcodec85
 
 tstcodec: tstcodec.o jbig.o jbig_ar.o
-	$(CC) $(CFLAGS) -o tstcodec $+
+	$(CC) $(LDFLAGS) $(CFLAGS) -o tstcodec $+
 
 tstcodec85: tstcodec85.o jbig85.o jbig_ar.o
-	$(CC) $(CFLAGS) -o tstcodec85 $+
+	$(CC) $(LDFLAGS) $(CFLAGS) -o tstcodec85 $+
 
 libjbig.a: jbig.o jbig_ar.o
 	rm -f libjbig.a
-	ar rc libjbig.a jbig.o jbig_ar.o
-	-ranlib libjbig.a
+	$(AR) rc libjbig.a jbig.o jbig_ar.o
+	-$(RANLIB) libjbig.a
+
+SOBJS = jbig.lo jbig_ar.lo
+
+libjbig.so: $(SOBJS)
+	$(CC) -shared $(LDFLAGS) -o $@ -Wl,-soname -Wl,$@ $(SOBJS)
+
+libjbig.dylib: $(SOBJS)
+	$(CC) -dynamic $(LDFLAGS) -o $@ -dynamiclib -install_name $(LIBDIR)/$@ $(SOBJS)
+
+SOBJS85 = jbig85.lo jbig_ar.lo
+
+libjbig85.so: $(SOBJS85)
+	$(CC) -shared $(LDFLAGS) -o $@ -Wl,-soname -Wl,$@ $(SOBJS85)
+
+libjbig85.dylib: $(SOBJS85)
+	$(CC) -dynamic $(LDFLAGS) -o $@ -dynamiclib -install_name $(LIBDIR)/$@ $(SOBJS85)
+
+%.lo: %.c jbig.h jbig85.h jbig_ar.h
+	$(CC) $(CFLAGS) -fPIC -c $< -o $@
 
 libjbig85.a: jbig85.o jbig_ar.o
 	rm -f libjbig85.a
-	ar rc libjbig85.a jbig85.o jbig_ar.o
-	-ranlib libjbig85.a
+	$(AR) rc libjbig85.a jbig85.o jbig_ar.o
+	-$(RANLIB) libjbig85.a
 
 jbig.o: jbig.c jbig.h jbig_ar.h
 jbig85.o: jbig85.c jbig85.h jbig_ar.h
diff -ur jbigkit.orig/Makefile jbigkit/Makefile
--- jbigkit.orig/Makefile	2008-08-30 23:40:22.000000000 +0300
+++ jbigkit/Makefile	2010-02-28 12:59:07.000000000 +0200
@@ -1,34 +1,25 @@
 # Unix makefile for JBIG-KIT
 # $Id: jbigkit-2.0-r1-build.patch,v 1.1 2010/03/15 19:55:43 grobian Exp $
 
-# Select an ANSI/ISO C compiler here, GNU gcc is recommended
-CC = gcc
-
-# Options for the compiler: A high optimization level is suggested
-CCFLAGS = -O2 -W
-#CCFLAGS = -O -g -W -Wall -ansi -pedantic #-DDEBUG  # developer only
-
-CFLAGS = $(CCFLAGS) -I../libjbig
-
 VERSION=2.0
 
 all: lib pbm
-	@echo "Enter 'make test' in order to start some automatic tests."
+	@echo "Enter '$(MAKE) test' in order to start some automatic tests."
 
 lib:
-	(cd libjbig;  make "CC=$(CC)" "CFLAGS=$(CFLAGS)")
+	(cd libjbig;  $(MAKE))
 
 pbm: lib
-	(cd pbmtools; make "CC=$(CC)" "CFLAGS=$(CFLAGS)")
+	(cd pbmtools; $(MAKE))
 
 test: lib pbm
-	(cd libjbig;  make "CC=$(CC)" "CFLAGS=$(CFLAGS)" test)
-	(cd pbmtools; make "CC=$(CC)" "CFLAGS=$(CFLAGS)" test)
+	(cd libjbig;  $(MAKE) test)
+	(cd pbmtools; $(MAKE) test)
 
 clean:
 	rm -f *~ core
-	(cd libjbig; make clean)
-	(cd pbmtools; make clean)
+	(cd libjbig;  $(MAKE) clean)
+	(cd pbmtools; $(MAKE) clean)
 
 distribution: clean
 	rm -f libjbig/libjbig*.a
diff -ur jbigkit.orig/pbmtools/Makefile jbigkit/pbmtools/Makefile
--- jbigkit.orig/pbmtools/Makefile	2008-08-26 01:26:39.000000000 +0300
+++ jbigkit/pbmtools/Makefile	2010-02-28 13:01:19.000000000 +0200
@@ -2,10 +2,10 @@
 # $Id: jbigkit-2.0-r1-build.patch,v 1.1 2010/03/15 19:55:43 grobian Exp $
 
 # Select an ANSI/ISO C compiler here, e.g. GNU gcc is recommended
-CC = gcc
+CC ?= gcc
 
 # Options for the compiler
-CFLAGS = -g -Wall -ansi -pedantic -I../libjbig # --coverage
+CFLAGS += -Wall -ansi -pedantic -I../libjbig
 
 .SUFFIXES: .1 .5 .txt $(SUFFIXES)
 
@@ -13,16 +13,16 @@
 	pbmtojbg.txt jbgtopbm.txt pbm.txt pgm.txt
 
 pbmtojbg: pbmtojbg.o ../libjbig/libjbig.a
-	$(CC) $(CFLAGS) -o pbmtojbg pbmtojbg.o -L../libjbig -ljbig
+	$(CC) $(LDFLAGS) $(CFLAGS) -o pbmtojbg pbmtojbg.o -L../libjbig -ljbig
 
 jbgtopbm: jbgtopbm.o ../libjbig/libjbig.a
-	$(CC) $(CFLAGS) -o jbgtopbm jbgtopbm.o -L../libjbig -ljbig
+	$(CC) $(LDFLAGS) $(CFLAGS) -o jbgtopbm jbgtopbm.o -L../libjbig -ljbig
 
 pbmtojbg85: pbmtojbg85.o ../libjbig/libjbig85.a
-	$(CC) $(CFLAGS) -o pbmtojbg85 pbmtojbg85.o -L../libjbig -ljbig85
+	$(CC) $(LDFLAGS) $(CFLAGS) -o pbmtojbg85 pbmtojbg85.o -L../libjbig -ljbig85
 
 jbgtopbm85: jbgtopbm85.o ../libjbig/libjbig85.a
-	$(CC) $(CFLAGS) -o jbgtopbm85 jbgtopbm85.o -L../libjbig -ljbig85
+	$(CC) $(LDFLAGS) $(CFLAGS) -o jbgtopbm85 jbgtopbm85.o -L../libjbig -ljbig85
 
 jbgtopbm.o: jbgtopbm.c ../libjbig/jbig.h
 pbmtojbg.o: pbmtojbg.c ../libjbig/jbig.h
@@ -31,31 +31,31 @@
 
 ../libjbig/libjbig.a: ../libjbig/jbig.c ../libjbig/jbig.h \
 	../libjbig/jbig_ar.c ../libjbig/jbig_ar.h
-	make -C ../libjbig libjbig.a
+	$(MAKE) -C ../libjbig libjbig.a
 
 ../libjbig/libjbig85.a: ../libjbig/jbig85.c ../libjbig/jbig85.h \
 	../libjbig/jbig_ar.c ../libjbig/jbig_ar.h
-	make -C ../libjbig libjbig85.a
+	$(MAKE) -C ../libjbig libjbig85.a
 
 test: test82 test85
 
 test82: pbmtojbg jbgtopbm
-	make IMG=ccitt1     OPTIONSP=                      dotest1
-	make IMG=ccitt2     OPTIONSP=                      dotest1
-	make IMG=ccitt3     OPTIONSP=                      dotest1
-	make IMG=xvlogo    "OPTIONSP=-d 3"                 dotest1
-	make IMG=sandra     OPTIONSP=      OPTIONSJ=       dotest2g
-	make IMG=sandra     OPTIONSP=-b    OPTIONSJ=-b     dotest2g
-	make IMG=sandra     OPTIONSP=-q    OPTIONSJ=       dotest2g
-	make IMG=sandra    "OPTIONSP=-o 0" OPTIONSJ=       dotest2g
-	make IMG=sandra    "OPTIONSP=-o 2" OPTIONSJ=       dotest2g
-	make IMG=multi      OPTIONSP=      OPTIONSJ=       dotest2g
-	make IMG=multi      OPTIONSP=-b    OPTIONSJ=-b     dotest2g
-	make IMG=mx        "OPTIONSP=-q -s 3 -m 128"       dotest1
-	make IMG=mx        "OPTIONSP=-q -s 3 -m 128"       dotest2b
-	make IMG=mx        "OPTIONSP=-q -s 3 -m 128 -p 92" dotest2b
-	make IMG=mx        "OPTIONSP=-q -Y -1"             dotest2b
-	make IMG=mx        "OPTIONSP=-Y -1"                dotest2b
+	$(MAKE) IMG=ccitt1     OPTIONSP=                      dotest1
+	$(MAKE) IMG=ccitt2     OPTIONSP=                      dotest1
+	$(MAKE) IMG=ccitt3     OPTIONSP=                      dotest1
+	$(MAKE) IMG=xvlogo    "OPTIONSP=-d 3"                 dotest1
+	$(MAKE) IMG=sandra     OPTIONSP=      OPTIONSJ=       dotest2g
+	$(MAKE) IMG=sandra     OPTIONSP=-b    OPTIONSJ=-b     dotest2g
+	$(MAKE) IMG=sandra     OPTIONSP=-q    OPTIONSJ=       dotest2g
+	$(MAKE) IMG=sandra    "OPTIONSP=-o 0" OPTIONSJ=       dotest2g
+	$(MAKE) IMG=sandra    "OPTIONSP=-o 2" OPTIONSJ=       dotest2g
+	$(MAKE) IMG=multi      OPTIONSP=      OPTIONSJ=       dotest2g
+	$(MAKE) IMG=multi      OPTIONSP=-b    OPTIONSJ=-b     dotest2g
+	$(MAKE) IMG=mx        "OPTIONSP=-q -s 3 -m 128"       dotest1
+	$(MAKE) IMG=mx        "OPTIONSP=-q -s 3 -m 128"       dotest2b
+	$(MAKE) IMG=mx        "OPTIONSP=-q -s 3 -m 128 -p 92" dotest2b
+	$(MAKE) IMG=mx        "OPTIONSP=-q -Y -1"             dotest2b
+	$(MAKE) IMG=mx        "OPTIONSP=-Y -1"                dotest2b
 	rm -f test-*.jbg test-*.pbm test-*.pgm
 	./jbgtopbm ../examples/ccitt1.jbg | ./pbmtojbg > test-ccitt1.jbg
 	cmp ../examples/ccitt1.jbg test-ccitt1.jbg
@@ -91,24 +91,24 @@
 	cmp test-$(IMG).pgm ../examples/$(IMG).pgm
 
 test85: pbmtojbg jbgtopbm pbmtojbg85 jbgtopbm85 test-t82.pbm
-	make IMG=t82 "OPTIONSP=-p 0"      dotest85
-	make IMG=t82 "OPTIONSP=-p 8"      dotest85
-	make IMG=t82 "OPTIONSP=-p 8 -r"   dotest85b
-	make IMG=t82 "OPTIONSP=-p 64"     dotest85
-	make IMG=t82 "OPTIONSP=-p 72"     dotest85
-	make IMG=t82 "OPTIONSP=-s 2 -C c" dotest85
-	make IMG=t82 "OPTIONSP=-s 99999"  dotest85
-	make IMG=t82 "OPTIONSP=-Y 9999 0" dotest85
-	make IMG=t82 "OPTIONSP=-Y 1951 0" dotest85
-	make IMG=t82 "OPTIONSP=-Y -1 127" dotest85
-	make IMG=t82 "OPTIONSP=-Y -1 128" dotest85
-	make IMG=t82 "OPTIONSP=-Y -1 1919" dotest85
-	make IMG=t82 "OPTIONSP=-Y -1 1920" dotest85
-	make IMG=t82 "OPTIONSP=-Y -1 1949" dotest85
-	make IMG=t82 "OPTIONSP=-Y -1 1950" dotest85
-	make IMG=ccitt1 dotest85
-	make IMG=ccitt2 dotest85
-	make IMG=ccitt3 dotest85
+	$(MAKE) IMG=t82 "OPTIONSP=-p 0"      dotest85
+	$(MAKE) IMG=t82 "OPTIONSP=-p 8"      dotest85
+	$(MAKE) IMG=t82 "OPTIONSP=-p 8 -r"   dotest85b
+	$(MAKE) IMG=t82 "OPTIONSP=-p 64"     dotest85
+	$(MAKE) IMG=t82 "OPTIONSP=-p 72"     dotest85
+	$(MAKE) IMG=t82 "OPTIONSP=-s 2 -C c" dotest85
+	$(MAKE) IMG=t82 "OPTIONSP=-s 99999"  dotest85
+	$(MAKE) IMG=t82 "OPTIONSP=-Y 9999 0" dotest85
+	$(MAKE) IMG=t82 "OPTIONSP=-Y 1951 0" dotest85
+	$(MAKE) IMG=t82 "OPTIONSP=-Y -1 127" dotest85
+	$(MAKE) IMG=t82 "OPTIONSP=-Y -1 128" dotest85
+	$(MAKE) IMG=t82 "OPTIONSP=-Y -1 1919" dotest85
+	$(MAKE) IMG=t82 "OPTIONSP=-Y -1 1920" dotest85
+	$(MAKE) IMG=t82 "OPTIONSP=-Y -1 1949" dotest85
+	$(MAKE) IMG=t82 "OPTIONSP=-Y -1 1950" dotest85
+	$(MAKE) IMG=ccitt1 dotest85
+	$(MAKE) IMG=ccitt2 dotest85
+	$(MAKE) IMG=ccitt3 dotest85
 	rm -f test-*.jbg test-*.jbg85 test-*.pbm
 	@echo
 	@echo "The T.85 pbmtools have PASSED the functional tests. Good!"
@@ -142,7 +142,7 @@
 	./jbgtopbm $< $@
 
 test-t82.pbm:
-	make -C ../libjbig tstcodec
+	$(MAKE) -C ../libjbig tstcodec
 	../libjbig/tstcodec $@
 
 .1.txt .5.txt: