diff --git a/README.md b/README.md
index e23afed..d1e3f5d 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # jbigkit
 
+Data compression library/utilities for bi-level high-resolution images.
+
diff --git a/jbigkit-2.1-build_warnings.patch b/jbigkit-2.1-build_warnings.patch
new file mode 100644
index 0000000..9d2008d
--- /dev/null
+++ b/jbigkit-2.1-build_warnings.patch
@@ -0,0 +1,77 @@
+diff -up jbigkit-2.1/pbmtools/pbmtojbg85.c.warnings jbigkit-2.1/pbmtools/pbmtojbg85.c
+--- jbigkit-2.1/pbmtools/pbmtojbg85.c.warnings	2008-08-26 00:26:39.000000000 +0200
++++ jbigkit-2.1/pbmtools/pbmtojbg85.c	2012-07-17 16:24:56.741332942 +0200
+@@ -72,9 +72,12 @@ static unsigned long getint(FILE *f)
+       while ((c = getc(f)) != EOF && !(c == 13 || c == 10)) ;
+   if (c != EOF) {
+     ungetc(c, f);
+-    fscanf(f, "%lu", &i);
++    if (fscanf(f, "%lu", &i) != 1) {
++      /* should never fail, since c must be a digit */
++      fprintf(stderr, "Unexpected failure reading digit '%c'\n", c);
++      exit(1);
++    }
+   }
+-
+   return i;
+ }
+ 
+@@ -239,7 +242,9 @@ int main (int argc, char **argv)
+       break;
+     case '4':
+       /* PBM raw binary format */
+-      fread(next_line, bpl, 1, fin);
++      if (fread(next_line, bpl, 1, fin) != 1) {
++	/* silence compiler warnings; ferror/feof checked below */
++      }
+       break;
+     default:
+       fprintf(stderr, "Unsupported PBM type P%c!\n", type);
+diff -up jbigkit-2.1/pbmtools/pbmtojbg.c.warnings jbigkit-2.1/pbmtools/pbmtojbg.c
+--- jbigkit-2.1/pbmtools/pbmtojbg.c.warnings	2008-07-16 22:59:41.000000000 +0200
++++ jbigkit-2.1/pbmtools/pbmtojbg.c	2012-07-17 16:23:46.584285686 +0200
+@@ -88,7 +88,11 @@ static unsigned long getint(FILE *f)
+       while ((c = getc(f)) != EOF && !(c == 13 || c == 10)) ;
+   if (c != EOF) {
+     ungetc(c, f);
+-    fscanf(f, "%lu", &i);
++    if (fscanf(f, "%lu", &i) != 1) {
++      /* should never fail, since c must be a digit */
++      fprintf(stderr, "Unexpected failure reading digit '%c'\n", c);
++      exit(1);
++    }
+   }
+ 
+   return i;
+@@ -302,7 +306,9 @@ int main (int argc, char **argv)
+     break;
+   case '4':
+     /* PBM raw binary format */
+-    fread(bitmap[0], bitmap_size, 1, fin);
++    if (fread(bitmap[0], bitmap_size, 1, fin) != 1) {
++      /* silence compiler warnings; ferror/feof checked below */
++    }
+     break;
+   case '2':
+   case '5':
+@@ -314,8 +320,18 @@ int main (int argc, char **argv)
+ 	for (j = 0; j < bpp; j++)
+ 	  image[x * bpp + (bpp - 1) - j] = v >> (j * 8);
+       }
+-    } else
+-      fread(image, width * height, bpp, fin);
++    } else {
++      if (fread(image, width * height, bpp, fin) != (size_t) bpp) {
++	if (ferror(fin)) {
++	  fprintf(stderr, "Problem while reading input file '%s", fnin);
++	  perror("'");
++	  exit(1);
++	} else {
++	  fprintf(stderr, "Unexpected end of input file '%s'!\n", fnin);
++	  exit(1);
++	}
++      }
++    }
+     jbg_split_planes(width, height, planes, encode_planes, image, bitmap,
+ 		     use_graycode);
+     free(image);
diff --git a/jbigkit-2.1-coverity.patch b/jbigkit-2.1-coverity.patch
new file mode 100644
index 0000000..22282b9
--- /dev/null
+++ b/jbigkit-2.1-coverity.patch
@@ -0,0 +1,30 @@
+diff --git a/libjbig/jbig.c b/libjbig/jbig.c
+index 751ceff..3c76e07 100644
+--- a/libjbig/jbig.c
++++ b/libjbig/jbig.c
+@@ -889,7 +889,7 @@ void jbg_enc_options(struct jbg_enc_state *s, int order, int options,
+   if (order >= 0 && order <= 0x0f) s->order = order;
+   if (options >= 0) s->options = options;
+   if (l0 > 0) s->l0 = l0;
+-  if (mx >= 0 && my < 128) s->mx = mx;
++  if (mx >= 0 && mx < 128) s->mx = mx;
+   if (my >= 0 && my < 256) s->my = my;
+ 
+   return;
+diff --git a/pbmtools/Makefile b/pbmtools/Makefile
+index 85e1783..6ae2d33 100644
+--- a/pbmtools/Makefile
++++ b/pbmtools/Makefile
+@@ -56,9 +56,9 @@ test82: pbmtojbg jbgtopbm
+ 	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 -s 3 -m 127"       dotest1
++	make IMG=mx        "OPTIONSP=-q -s 3 -m 127"       dotest2b
++	make IMG=mx        "OPTIONSP=-q -s 3 -m 127 -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
diff --git a/jbigkit-2.1-jbg_newlen-check-for-end-of-file-within-MARKER_NEWLE.patch b/jbigkit-2.1-jbg_newlen-check-for-end-of-file-within-MARKER_NEWLE.patch
new file mode 100644
index 0000000..1afffaa
--- /dev/null
+++ b/jbigkit-2.1-jbg_newlen-check-for-end-of-file-within-MARKER_NEWLE.patch
@@ -0,0 +1,28 @@
+From 7d3c1bea895d910907e2501fe9165e353eceabae Mon Sep 17 00:00:00 2001
+From: Markus Kuhn <Markus.Kuhn@cl.cam.ac.uk>
+Date: Mon, 15 Feb 2021 18:27:47 +0000
+Subject: [PATCH 15/15] jbg_newlen(): check for end-of-file within
+ MARKER_NEWLEN
+
+fixes https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=969593
+reported by Casper Sun
+---
+ libjbig/jbig.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/libjbig/jbig.c b/libjbig/jbig.c
+index e9938e5..289b6d8 100644
+--- a/libjbig/jbig.c
++++ b/libjbig/jbig.c
+@@ -3272,6 +3272,8 @@ int jbg_newlen(unsigned char *bie, size_t len)
+     else if (p[0] == MARKER_ESC)
+       switch (p[1]) {
+       case MARKER_NEWLEN:
++        if (p + 5 >= bie + len)
++          return JBG_EAGAIN;
+ 	y = (((long) bie[ 8] << 24) | ((long) bie[ 9] << 16) |
+ 	     ((long) bie[10] <<  8) |  (long) bie[11]);
+ 	yn = (((long) p[2] << 24) | ((long) p[3] << 16) |
+-- 
+2.45.0
+
diff --git a/jbigkit-2.1-ldflags.patch b/jbigkit-2.1-ldflags.patch
new file mode 100644
index 0000000..3d24f69
--- /dev/null
+++ b/jbigkit-2.1-ldflags.patch
@@ -0,0 +1,51 @@
+diff -up jbigkit-2.1/libjbig/Makefile.ldflags jbigkit-2.1/libjbig/Makefile
+--- jbigkit-2.1/libjbig/Makefile.ldflags	2018-02-27 17:50:15.786038149 +0100
++++ jbigkit-2.1/libjbig/Makefile	2018-02-27 17:55:44.042093437 +0100
+@@ -10,19 +10,19 @@ PICFLAGS := -fPIC -DPIC
+ all: libjbig.so.$(VERSION) tstcodec tstcodec85
+ 
+ tstcodec: tstcodec.o libjbig.so
+-	$(CC) $(CFLAGS) -o tstcodec $< -L. -ljbig
++	$(CC) $(CFLAGS) -o tstcodec $< -L. -ljbig $(LDFLAGS)
+ 
+ tstcodec85: tstcodec85.o libjbig85.so
+-	$(CC) $(CFLAGS) -o tstcodec85 $< -L. -ljbig85
++	$(CC) $(CFLAGS) -o tstcodec85 $< -L. -ljbig85 $(LDFLAGS)
+ 
+ %.so: %.so.$(VERSION)
+ 	ln -sf $< $@
+ 
+ libjbig.so.$(VERSION): jbig.o jbig_ar.o
+-	$(CC) $(CFLAGS) -shared -Wl,-soname,$@ -o $@ $^
++	$(CC) $(CFLAGS) $(LDFLAGS) -shared -Wl,-soname,$@ -o $@ $^
+ 
+ libjbig85.so.$(VERSION): jbig85.o jbig_ar.o
+-	$(CC) $(CFLAGS) -shared -Wl,-soname,$@ -o $@ $^
++	$(CC) $(CFLAGS) $(LDFLAGS) -shared -Wl,-soname,$@ -o $@ $^
+ 
+ jbig.o jbig85.o jbig_ar.o: CFLAGS += $(PICFLAGS)
+ 
+diff -up jbigkit-2.1/pbmtools/Makefile.ldflags jbigkit-2.1/pbmtools/Makefile
+--- jbigkit-2.1/pbmtools/Makefile.ldflags	2018-02-27 17:50:35.902857687 +0100
++++ jbigkit-2.1/pbmtools/Makefile	2018-02-27 17:57:09.296328639 +0100
+@@ -15,16 +15,16 @@ all: pbmtojbg jbgtopbm pbmtojbg85 jbgtop
+ txt: pbmtojbg.txt jbgtopbm.txt pbm.txt pgm.txt
+ 
+ pbmtojbg: pbmtojbg.o ../libjbig/libjbig.so
+-	$(CC) $(CFLAGS) -o pbmtojbg pbmtojbg.o -L../libjbig -ljbig
++	$(CC) $(CFLAGS) -o pbmtojbg pbmtojbg.o -L../libjbig -ljbig $(LDFLAGS)
+ 
+ jbgtopbm: jbgtopbm.o ../libjbig/libjbig.so
+-	$(CC) $(CFLAGS) -o jbgtopbm jbgtopbm.o -L../libjbig -ljbig
++	$(CC) $(CFLAGS) -o jbgtopbm jbgtopbm.o -L../libjbig -ljbig $(LDFLAGS)
+ 
+ pbmtojbg85: pbmtojbg85.o ../libjbig/libjbig85.so
+-	$(CC) $(CFLAGS) -o pbmtojbg85 pbmtojbg85.o -L../libjbig -ljbig85
++	$(CC) $(CFLAGS) -o pbmtojbg85 pbmtojbg85.o -L../libjbig -ljbig85 $(LDFLAGS)
+ 
+ jbgtopbm85: jbgtopbm85.o ../libjbig/libjbig85.so
+-	$(CC) $(CFLAGS) -o jbgtopbm85 jbgtopbm85.o -L../libjbig -ljbig85
++	$(CC) $(CFLAGS) -o jbgtopbm85 jbgtopbm85.o -L../libjbig -ljbig85 $(LDFLAGS)
+ 
+ jbgtopbm.o: jbgtopbm.c ../libjbig/jbig.h
+ pbmtojbg.o: pbmtojbg.c ../libjbig/jbig.h
diff --git a/jbigkit-2.1-new-jbig.c-limit-s-maxmem-maximum-decoded-image-size.patch b/jbigkit-2.1-new-jbig.c-limit-s-maxmem-maximum-decoded-image-size.patch
new file mode 100644
index 0000000..dbc20d2
--- /dev/null
+++ b/jbigkit-2.1-new-jbig.c-limit-s-maxmem-maximum-decoded-image-size.patch
@@ -0,0 +1,113 @@
+From bc3293299bc4981e83b7f37f3615a6b9b27b6837 Mon Sep 17 00:00:00 2001
+From: Markus Kuhn <Markus.Kuhn@cl.cam.ac.uk>
+Date: Mon, 3 Aug 2020 21:09:39 +0100
+Subject: [PATCH 13/15] new jbig.c limit s->maxmem: maximum decoded image size
+ (default: 2 GB)
+
+this helps users to reduce denial-of-service risks, as in CVE-2017-9937
+---
+ CHANGES          |  9 +++++++++
+ libjbig/jbig.c   |  5 +++++
+ libjbig/jbig.h   |  2 ++
+ libjbig/jbig.txt | 39 ++++++++++++++++++++++++++++-----------
+ 4 files changed, 44 insertions(+), 11 deletions(-)
+
+diff --git a/libjbig/jbig.c b/libjbig/jbig.c
+index fe54946..e9938e5 100644
+--- a/libjbig/jbig.c
++++ b/libjbig/jbig.c
+@@ -2051,6 +2051,7 @@ void jbg_dec_init(struct jbg_dec_state *s)
+   s->xmax = 4294967295UL;
+   s->ymax = 4294967295UL;
+   s->dmax = 256;
++  s->maxmem = 2000000000;  /* no final image larger than 2 GB by default */
+   s->s = NULL;
+ 
+   return;
+@@ -2640,6 +2641,10 @@ int jbg_dec_in(struct jbg_dec_state *s, unsigned char *data, size_t len,
+       return JBG_EIMPL | 5;
+     s->options = s->buffer[19];
+ 
++    /* will the final image require more bytes than permitted by s->maxmem? */
++    if (s->maxmem / s->planes / s->yd / jbg_ceil_half(s->xd, 3) == 0)
++      return JBG_ENOMEM;   /* increase s->maxmem if needed */
++
+     /* calculate number of stripes that will be required */
+     s->stripes = jbg_stripes(s->l0, s->yd, s->d);
+ 
+diff --git a/libjbig/jbig.h b/libjbig/jbig.h
+index 81c1adc..2577399 100644
+--- a/libjbig/jbig.h
++++ b/libjbig/jbig.h
+@@ -181,6 +181,8 @@ struct jbg_dec_state {
+   unsigned long xmax, ymax;         /* if possible abort before image gets *
+ 				     * larger than this size */
+   int dmax;                                      /* abort after this layer */
++  size_t maxmem;               /* return JBG_ENOMEM if final image layer D
++                                  would require more than maxmem bytes     */
+ };
+ 
+ 
+diff --git a/libjbig/jbig.txt b/libjbig/jbig.txt
+index 70ca464..4547b12 100644
+--- a/libjbig/jbig.txt
++++ b/libjbig/jbig.txt
+@@ -2,7 +2,7 @@
+ Using the JBIG-KIT library
+ --------------------------
+ 
+-Markus Kuhn -- 2013-09-10
++Markus Kuhn -- 2020-08-03
+ 
+ 
+ This text explains how to use the functions provided by the JBIG-KIT
+@@ -735,19 +735,36 @@ None of the above limitations can be exceeded by a JBIG data stream
+ that conforms to the ITU-T T.85 application profile for the use of
+ JBIG1 in fax machines.
+ 
+-The current implementation of the jbig.c decoder does not impose any
+-limits on the image size that it will process, as long as malloc() is
+-able to allocate enough heap space for the resulting bitmaps. The only
+-exception is that jbg_dec_in() will return "Input data stream uses
++The maximum image size that a BIE header (BIH) can indicate is X_D =
++2^32-1 pixels wide, Y_D = 2^32-1 lines high, with P = 255 bits per
++pixel. Such an image would, in uncompressed form, require about 588
++exabytes. Once jbg_dec_in() has received the 20-byte long BIH at the
++start of the BIE, it will call malloc() to allocate enough memory to
++hold the uncompressed image planes. Users may, therefore, want to
++defend their application against excessive image-size parameters in a
++received BIH, by checking X_D, Y_D, and P against appropriate safety
++limits before handing over the BIE header to jbg_dec_in(). BIE headers
++indicating too large images might be abused for denial of service
++attacks, to exhaust the memory of a system (e.g., CVE-2017-9937). To
++manage this risk, the jbig.c decoder will now, by default, return "Not
++enough memory available" (JBG_ENOMEM) if the resulting final image
++layer would occupy more than 2 gigabytes. Users can adjust this limit
++by changing sd->maxmem right after having called jbg_dec_init(&sd).
++The actual amount of memory allocated with malloc() calls during the
++decoding process is somewhat higher (at least 25%) than the limit set
++in sd->maxmem, as the decoder requires additional heap memory that
++depends on the image dimensions.
++
++The jbg_dec_in() function will return "Input data stream uses
+ unimplemented JBIG features" (JBG_EIMPL | 1) if Y_D equals 0xffffffff,
+ which is an extreme value commonly used to encode images according to
+ ITU-T T.85 where the height was unknown when the BIH was emitted.
+-After jbg_dec_in() received the 20-byte long BIH at the start of the
+-BIE, it will malloc() to allocate enough memory to hold the requested
+-image planes and layers. If you want to defend your application
+-against excessive image-size parameters in a received BIH, then do
+-make sure that you check X_D, Y_D, and P against appropriate safety
+-limits before handing over the BIH to jbg_dec_in().
++
++All malloc(), realloc() and free() functions called by jbig.c are
++wrapped by the functions checked_malloc(), checked_realloc() and
++checked_free(). These simply call abort() when memory allocation
++fails. Developpers of embedded systems may want to replace them with
++alternative forms of exception handling.
+ 
+ There are two more limitations of the current implementation of the
+ jbig.c decoder that might cause problems with processing JBIG data
+-- 
+2.45.0
+
diff --git a/jbigkit-2.1-shared_lib.patch b/jbigkit-2.1-shared_lib.patch
new file mode 100644
index 0000000..00db81f
--- /dev/null
+++ b/jbigkit-2.1-shared_lib.patch
@@ -0,0 +1,160 @@
+diff -Naur jbigkit-2.1.old/libjbig/Makefile jbigkit-2.1/libjbig/Makefile
+--- jbigkit-2.1.old/libjbig/Makefile	2014-03-27 19:47:15.000000000 +0100
++++ jbigkit-2.1/libjbig/Makefile	2014-08-04 10:45:31.865773710 +0200
+@@ -4,25 +4,27 @@
+ CC = gcc
+ 
+ # Options for the compiler: A high optimization level is suggested
+-CFLAGS = -g -O -W -Wall -ansi -pedantic # --coverage
++CFLAGS = $(EXTRA_CFLAGS) -W -Wall -ansi -pedantic # --coverage
++PICFLAGS := -fPIC -DPIC
+ 
+-all: libjbig.a libjbig85.a tstcodec tstcodec85
++all: libjbig.so.$(VERSION) tstcodec tstcodec85
+ 
+-tstcodec: tstcodec.o jbig.o jbig_ar.o
+-	$(CC) $(CFLAGS) -o tstcodec tstcodec.o jbig.o jbig_ar.o
++tstcodec: tstcodec.o libjbig.so
++	$(CC) $(CFLAGS) -o tstcodec $< -L. -ljbig
+ 
+-tstcodec85: tstcodec85.o jbig85.o jbig_ar.o
+-	$(CC) $(CFLAGS) -o tstcodec85 tstcodec85.o jbig85.o jbig_ar.o
++tstcodec85: tstcodec85.o libjbig85.so
++	$(CC) $(CFLAGS) -o tstcodec85 $< -L. -ljbig85
+ 
+-libjbig.a: jbig.o jbig_ar.o
+-	rm -f libjbig.a
+-	ar rc libjbig.a jbig.o jbig_ar.o
+-	-ranlib libjbig.a
++%.so: %.so.$(VERSION)
++	ln -sf $< $@
+ 
+-libjbig85.a: jbig85.o jbig_ar.o
+-	rm -f libjbig85.a
+-	ar rc libjbig85.a jbig85.o jbig_ar.o
+-	-ranlib libjbig85.a
++libjbig.so.$(VERSION): jbig.o jbig_ar.o
++	$(CC) $(CFLAGS) -shared -Wl,-soname,$@ -o $@ $^
++
++libjbig85.so.$(VERSION): jbig85.o jbig_ar.o
++	$(CC) $(CFLAGS) -shared -Wl,-soname,$@ -o $@ $^
++
++jbig.o jbig85.o jbig_ar.o: CFLAGS += $(PICFLAGS)
+ 
+ jbig.o: jbig.c jbig.h jbig_ar.h
+ jbig85.o: jbig85.c jbig85.h jbig_ar.h
+@@ -43,11 +45,11 @@
+ 	clang --analyze *.c
+ 
+ test: tstcodec tstcodec85
+-	./tstcodec
+-	./tstcodec85
++	LD_LIBRARY_PATH=`pwd` ./tstcodec
++	LD_LIBRARY_PATH=`pwd` ./tstcodec85
+ 
+ t82test.pbm: tstcodec
+-	./tstcodec $@
++	LD_LIBRARY_PATH=`pwd` ./tstcodec $@
+ 
+ clean:
+ 	rm -f *.o *.gcda *.gcno *.gcov *.plist *~ core gmon.out dbg_d\=??.pbm
+diff -Naur jbigkit-2.1.old/Makefile jbigkit-2.1/Makefile
+--- jbigkit-2.1.old/Makefile	2014-03-27 19:47:15.000000000 +0100
++++ jbigkit-2.1/Makefile	2014-08-04 10:52:09.242027746 +0200
+@@ -4,25 +4,26 @@
+ CC = gcc
+ 
+ # Options for the compiler: A high optimization level is suggested
+-CFLAGS = -O2 -W -Wno-unused-result
++CFLAGS = $(EXTRA_CFLAGS) -W -Wno-unused-result
+ # CFLAGS = -O -g -W -Wall -Wno-unused-result -ansi -pedantic # -DDEBUG
+ 
+ export CC CFLAGS
+ 
+ VERSION=2.1
++export VERSION
+ 
+ all: lib pbm
+ 	@echo "Enter 'make test' in order to start some automatic tests."
+ 
+ lib:
+-	cd libjbig && $(MAKE) -e
++	make -C libjbig
+ 
+ pbm: lib
+-	cd pbmtools && $(MAKE) -e
++	make -C pbmtools
+ 
+ test: lib pbm
+-	cd libjbig  && $(MAKE) test
+-	cd pbmtools && $(MAKE) test
++	LD_LIBRARY_PATH=`pwd`/libjbig make -C libjbig test
++	LD_LIBRARY_PATH=`pwd`/libjbig make -C pbmtools test
+ 
+ analyze:
+ 	cd libjbig  && $(MAKE) analyze
+@@ -30,8 +31,8 @@
+ 
+ clean:
+ 	rm -f *~ core
+-	cd libjbig  && $(MAKE) clean
+-	cd pbmtools && $(MAKE) clean
++	make -C libjbig clean
++	make -C pbmtools clean
+ 
+ distribution:
+ 	rm -rf jbigkit-$(VERSION)
+diff -Naur jbigkit-2.1.old/pbmtools/Makefile jbigkit-2.1/pbmtools/Makefile
+--- jbigkit-2.1.old/pbmtools/Makefile	2014-03-27 19:47:15.000000000 +0100
++++ jbigkit-2.1/pbmtools/Makefile	2014-08-04 10:49:47.694581174 +0200
+@@ -4,26 +4,26 @@
+ CC = gcc
+ 
+ # Options for the compiler
+-CFLAGS = -g -O -W -Wall -Wno-unused-result -ansi -pedantic # --coverage
++CFLAGS = $(EXTRA_CFLAGS) -W -Wall -Wno-unused-result -ansi -pedantic # --coverage
+ CPPFLAGS = -I../libjbig 
+ 
+ .SUFFIXES: .1 .5 .txt $(SUFFIXES)
+ .PHONY: txt test test82 test85 clean
+ 
+-all: pbmtojbg jbgtopbm pbmtojbg85 jbgtopbm85 txt
++all: pbmtojbg jbgtopbm pbmtojbg85 jbgtopbm85 # txt
+ 
+ txt: pbmtojbg.txt jbgtopbm.txt pbm.txt pgm.txt
+ 
+-pbmtojbg: pbmtojbg.o ../libjbig/libjbig.a
++pbmtojbg: pbmtojbg.o ../libjbig/libjbig.so
+ 	$(CC) $(CFLAGS) -o pbmtojbg pbmtojbg.o -L../libjbig -ljbig
+ 
+-jbgtopbm: jbgtopbm.o ../libjbig/libjbig.a
++jbgtopbm: jbgtopbm.o ../libjbig/libjbig.so
+ 	$(CC) $(CFLAGS) -o jbgtopbm jbgtopbm.o -L../libjbig -ljbig
+ 
+-pbmtojbg85: pbmtojbg85.o ../libjbig/libjbig85.a
++pbmtojbg85: pbmtojbg85.o ../libjbig/libjbig85.so
+ 	$(CC) $(CFLAGS) -o pbmtojbg85 pbmtojbg85.o -L../libjbig -ljbig85
+ 
+-jbgtopbm85: jbgtopbm85.o ../libjbig/libjbig85.a
++jbgtopbm85: jbgtopbm85.o ../libjbig/libjbig85.so
+ 	$(CC) $(CFLAGS) -o jbgtopbm85 jbgtopbm85.o -L../libjbig -ljbig85
+ 
+ jbgtopbm.o: jbgtopbm.c ../libjbig/jbig.h
+@@ -31,13 +31,13 @@
+ jbgtopbm85.o: jbgtopbm85.c ../libjbig/jbig85.h
+ pbmtojbg85.o: pbmtojbg85.c ../libjbig/jbig85.h
+ 
+-../libjbig/libjbig.a: ../libjbig/jbig.c ../libjbig/jbig.h \
++../libjbig/libjbig.so: ../libjbig/jbig.c ../libjbig/jbig.h \
+ 	../libjbig/jbig_ar.c ../libjbig/jbig_ar.h
+-	make -C ../libjbig libjbig.a
++	make -C ../libjbig libjbig.so
+ 
+-../libjbig/libjbig85.a: ../libjbig/jbig85.c ../libjbig/jbig85.h \
++../libjbig/libjbig85.so: ../libjbig/jbig85.c ../libjbig/jbig85.h \
+ 	../libjbig/jbig_ar.c ../libjbig/jbig_ar.h
+-	make -C ../libjbig libjbig85.a
++	make -C ../libjbig libjbig85.so
+ 
+ analyze:
+ 	clang $(CPPFLAGS) --analyze *.c
diff --git a/jbigkit.spec b/jbigkit.spec
new file mode 100644
index 0000000..a423c38
--- /dev/null
+++ b/jbigkit.spec
@@ -0,0 +1,117 @@
+Name:          jbigkit
+Version:       2.1
+Release:       2mamba
+Summary:       Data compression library/utilities for bi-level high-resolution images
+Group:         System/Libraries
+Vendor:        openmamba
+Distribution:  openmamba
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
+URL:           https://www.cl.cam.ac.uk/~mgk25/jbigkit/
+Source:        https://www.cl.cam.ac.uk/~mgk25/jbigkit/download/jbigkit-%{version}.tar.gz
+Patch0:        jbigkit-2.1-shared_lib.patch
+Patch1:        jbigkit-2.1-ldflags.patch
+Patch2:        jbigkit-2.1-build_warnings.patch
+Patch3:        jbigkit-2.1-coverity.patch
+Patch4:        jbigkit-2.1-new-jbig.c-limit-s-maxmem-maximum-decoded-image-size.patch
+Patch5:        jbigkit-2.1-jbg_newlen-check-for-end-of-file-within-MARKER_NEWLE.patch
+License:       GPL
+## AUTOBUILDREQ-BEGIN
+BuildRequires: glibc-devel
+## AUTOBUILDREQ-END
+Requires:      lib%{name} = %{?epoch:%epoch:}%{version}-%{release}
+Provides:      libjbig-tools
+Obsoletes:     libjbig-tools < 2.1-2mamba
+
+%description
+Data compression library/utilities for bi-level high-resolution images.
+
+%package -n libjbig
+Group:         System/Libraries
+Summary:       Shared libraries for %{name}
+%ifarch x86_64 aarch64
+Provides:      libjbig.so.0()(64bit)
+Provides:      libjbig.so.2.0()(64bit)
+%else
+Provides:      libjbig.so.0
+Provides:      libjbig.so.2.0
+%endif
+
+%description -n libjbig
+This package contains shared libraries for %{name}.
+
+%package -n libjbig-devel
+Group:         Development/Libraries
+Summary:       Development files for %{name}
+Requires:      libjbig = %{?epoch:%epoch:}%{version}-%{release}
+
+%description -n libjbig-devel
+This package contains libraries and header files for developing applications that use %{name}.
+
+%debug_package
+
+%prep
+%setup -q
+%patch 0 -p1 -b .shared_lib
+%patch 1 -p1 -b .ldflags
+%patch 2 -p1 -b .build_warnings
+%patch 3 -p1 -b .coverity
+%patch 4 -p1 -b .new-jbig.c-limit-s-maxmem-maximum-decoded-image-size
+%patch 5 -p1 -b .jbg_newlen-check-for-end-of-file-within-MARKER_NEWLE
+
+%build
+%make EXTRA_CFLAGS="%{optflags}"
+
+%install
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+install -D -m0644 libjbig/*.h -t %{buildroot}%{_includedir}
+install -D -m0755 libjbig/*.so.* -t %{buildroot}%{_libdir}
+for lib in libjbig.so libjbig85.so; do
+   ln -sv "$lib.%{version}" %{buildroot}%{_libdir}/$lib
+done
+install -D -m0755 pbmtools/{jbgtopbm{,85},pbmtojbg{,85}} -t %{buildroot}%{_bindir}
+install -D -m0644 pbmtools/*.1* -t %{buildroot}%{_mandir}/man1/
+
+ln -s libjbig.so.2.1 %{buildroot}%{_libdir}/libjbig.so.0
+ln -s libjbig.so.2.1 %{buildroot}%{_libdir}/libjbig.so.2.0
+
+%clean
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+
+%files
+%defattr(-,root,root)
+%{_bindir}/jbgtopbm
+%{_bindir}/jbgtopbm85
+%{_bindir}/pbmtojbg
+%{_bindir}/pbmtojbg85
+%{_mandir}/man1/jbgtopbm.1*
+%{_mandir}/man1/pbmtojbg.1*
+
+%files -n libjbig
+%defattr(-,root,root)
+%{_libdir}/libjbig.so.*
+%{_libdir}/libjbig85.so.*
+%doc COPYING
+
+%files -n libjbig-devel
+%defattr(-,root,root)
+%{_includedir}/jbig.h
+%{_includedir}/jbig85.h
+%{_includedir}/jbig_ar.h
+%{_libdir}/libjbig.so
+%{_libdir}/libjbig85.so
+%doc CHANGES TODO
+
+
+%changelog
+* Fri Nov 29 2024 Silvan Calarco <silvan.calarco@mambasoft.it> 2.1-2mamba
+- rename from libjbig to jbigkit; apply well known patches
+
+* Sun Feb 14 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 2.1-1mamba
+- update to 2.1
+
+* Mon Dec 19 2011 Silvan Calarco <silvan.calarco@mambasoft.it> 2.0-2mamba
+- added patch to build shared library
+- install required header file jbig_ar.h
+
+* Sun Jul 05 2009 Tiziana Ferro <tiziana.ferro@email.it> 2.0-1mamba
+- package created by autospec
\ No newline at end of file