jbig2enc

Today, on the recommendation of one of the readers of this blog, I decided to install jbig2enc to see how it might be useful for my digitization project. Unfortunately, it didn't seem to compile out of the box:

[psy@sable:~/src/agl-jbig2enc-edebc5a]$ make
g++ -c jbig2enc.cc -I../leptonlib-1.64/src -Wall -I/usr/include -L/usr/lib -O3 
g++ -c jbig2arith.cc -I../leptonlib-1.64/src -Wall -I/usr/include -L/usr/lib -O3 
g++ -c jbig2sym.cc -DUSE_EXT -I../leptonlib-1.64/src -Wall -I/usr/include -L/usr/lib -O3 
ar -rcv libjbig2enc.a jbig2enc.o jbig2arith.o jbig2sym.o
a - jbig2enc.o
a - jbig2arith.o
a - jbig2sym.o
g++ -o jbig2 jbig2.cc -L. -ljbig2enc ../leptonlib-1.64/src/liblept.a -I../leptonlib-1.64/src -Wall -I/usr/include -L/usr/lib -O3  -lpng -ljpeg -ltiff -lm
../leptonlib-1.64/src/liblept.a(gifio.o): In function `pixWriteStreamGif':
gifio.c:(.text+0x15c): undefined reference to `MakeMapObject'
gifio.c:(.text+0x21d): undefined reference to `EGifOpenFileHandle'
gifio.c:(.text+0x258): undefined reference to `EGifPutScreenDesc'
gifio.c:(.text+0x26f): undefined reference to `FreeMapObject'
gifio.c:(.text+0x277): undefined reference to `EGifCloseFile'
gifio.c:(.text+0x2b0): undefined reference to `FreeMapObject'
gifio.c:(.text+0x2df): undefined reference to `FreeMapObject'
gifio.c:(.text+0x2ff): undefined reference to `EGifPutImageDesc'
gifio.c:(.text+0x31a): undefined reference to `EGifCloseFile'
gifio.c:(.text+0x502): undefined reference to `EGifPutLine'
gifio.c:(.text+0x537): undefined reference to `EGifPutComment'
gifio.c:(.text+0x569): undefined reference to `EGifCloseFile'
gifio.c:(.text+0x582): undefined reference to `FreeMapObject'
gifio.c:(.text+0x5e0): undefined reference to `EGifCloseFile'
gifio.c:(.text+0x653): undefined reference to `EGifCloseFile'
gifio.c:(.text+0x682): undefined reference to `EGifCloseFile'
../leptonlib-1.64/src/liblept.a(gifio.o): In function `pixReadStreamGif':
gifio.c:(.text+0x6ce): undefined reference to `DGifOpenFileHandle'
gifio.c:(.text+0x6e6): undefined reference to `DGifSlurp'
gifio.c:(.text+0x878): undefined reference to `DGifCloseFile'
gifio.c:(.text+0x884): undefined reference to `DGifCloseFile'
gifio.c:(.text+0x9bc): undefined reference to `DGifCloseFile'
gifio.c:(.text+0xa2c): undefined reference to `DGifCloseFile'
gifio.c:(.text+0xa55): undefined reference to `DGifCloseFile'
../leptonlib-1.64/src/liblept.a(gifio.o):gifio.c:(.text+0xa86): more undefined references to `DGifCloseFile' follow
collect2: ld returned 1 exit status
make: *** [jbig2] Error 1
[psy@sable:~/src/agl-jbig2enc-edebc5a]$ 

It seems there were a few things wrong with the Makefile. The showstopper was that Leptonica, the library upon which jbig2enc depends, is expecting to link to giflib, but the Makefile doesn't specify this library. This was solved by adding -lgif to the command which compiles jbig2. The other problems were not fatal but somewhat irritating:

• it is assumed that Leptonica isn't installed in a standard location;
• there are no install and uninstall targets for (un)installing the package;
• the program is written in C++, but the compiler is invoked with a redefined $(CC) rather than the standard $(CXX);
• ar is invoked directly rather than through the standard $(AR); and
• the clean target uses wildcards somewhat dangerously.

So here's an updated Makefile for jbig2enc 0.27. It should work with little or no modification on most *nix systems. On 64-bit systems which use lib64 directories, the libdir variable should be changed appropriately, or else it should be overriden on the command line.

# Improved Makefile for jbig2enc by Tristan Miller, 2010-03-22

prefix=/usr/local
exec_prefix=$(prefix)
bindir=$(exec_prefix)/bin
libdir=$(exec_prefix)/lib
CFLAGS=-I/usr/local/include/liblept -I/usr/include/liblept -Wall -O3 ${EXTRA}

jbig2: libjbig2enc.a jbig2.cc
 $(CXX) -o jbig2 jbig2.cc -L. -ljbig2enc $(CFLAGS) -lpng -ljpeg -ltiff -lm -llept -lgif

libjbig2enc.a: jbig2enc.o jbig2arith.o jbig2sym.o
 $(AR) -rcv libjbig2enc.a jbig2enc.o jbig2arith.o jbig2sym.o

jbig2enc.o: jbig2enc.cc jbig2arith.h jbig2sym.h jbig2structs.h jbig2segments.h
 $(CXX) -c jbig2enc.cc $(CFLAGS)

jbig2arith.o: jbig2arith.cc jbig2arith.h
 $(CXX) -c jbig2arith.cc $(CFLAGS)

jbig2sym.o: jbig2sym.cc jbig2arith.h
 $(CXX) -c jbig2sym.cc -DUSE_EXT $(CFLAGS)

clean:
 rm -f jbig2enc.o jbig2arith.o jbig2sym.o jbig2 libjbig2enc.a

install:
 install -s jbig2 $(bindir)
 install pdf.py $(bindir)
 install -s libjbig2enc.a $(libdir)

uninstall:
 rm $(bindir)/jbig2
 rm $(bindir)/pdf.py
 rm $(libdir)/libjbig2enc.a