On Sat, 29 May 2004, Bernhard Praschinger wrote:
> I just try to compile the mjpegtools (CVS version) on a MAC OS X.
> Additional to the packages mentioned in the compile description on the
> mjpeg.sf.page. I had to install the libjepg 6b (I did a: make install,
> Now it seems that the compile fails when I try to link the first program
> to the jpeg-lib:
Actually the error is that somehow the jpeg library was not added
to the list of "-l" entries - you are missing the "-ljpeg"
> /bin/sh ../libtool --mode=link gcc -mcpu=7450 -mtune=7450 -g -O2 -Wall
> -Wunused -o lav2yuv lav2yuv.o lav_common.o ../utils/libmjpegutils.la
> liblavfile.la liblavjpeg.la
> gcc -mcpu=7450 -mtune=7450 -g -O2 -Wall -Wunused -o .libs/lav2yuv
> lav2yuv.o lav_common.o ../utils/.libs/libmjpegutils.dylib
> ./.libs/liblavfile.dylib ./.libs/liblavjpeg.dylib
> ld: Undefined symbols:
> _jpeg_CreateCompress
If you look closely you will see that "-ljpeg" is missing and that
is why the symbol is coming up undefined.
> Does anyone have a idea what fails there ? And how to fix it ?
Look in the config.log to see why the jpeg library was not
detected. In config.log it should look something like this
for a successful probe:
configure:23242: checking for jpeg_start_compress in -ljpeg
configure:23273: gcc -o conftest -g -O2 conftest.c -ljpeg >&5
configure:23276: $? = 0
The lav2yuv build looks like on my OS/X system:
/bin/sh ../libtool --mode=link gcc -mcpu=G5 -force_cpusubtype_ALL -mtune=G5 -g -O2
-Wall -Wunused -o lav2yuv lav2yuv.o lav_common.o ../utils/libmjpegutils.la
liblavfile.la liblavjpeg.la -L/usr/local/lib -ldv -lm -L/usr/local/lib -lglib
-lpthread
gcc -mcpu=G5 -force_cpusubtype_ALL -mtune=G5 -g -O2 -Wall -Wunused -o .libs/lav2yuv
lav2yuv.o lav_common.o ../utils/.libs/libmjpegutils-1.6.0.3.3.dylib
./.libs/liblavfile-1.6.0.3.3.dylib -L/usr/local/lib
/usr/local/lib/libquicktime.0.0.0.dylib -ldl ./.libs/liblavjpeg-1.6.0.3.3.dylib
/usr/local/lib/libjpeg.dylib /usr/local/lib/libdv.4.0.0.dylib -lm
/usr/local/lib/libglib.dylib -lpthread
creating lav2yuv
Most of those you probably don't have - I have libquicktime and
libdv installed on the system.
But see the libjpeg.dylib?
When you built and installed the jpeg library did you create the
shared version? In /usr/local/lib I have:
-rwxr-xr-x 1 sms admin 134912 1 Apr 18:29 /usr/local/lib/libjpeg.62.0.0.dylib
lrwxr-xr-x 1 root admin 20 1 Apr 18:29 /usr/local/lib/libjpeg.62.dylib ->
libjpeg.62.0.0.dylib
-rw-r--r-- 1 sms admin 173816 1 Apr 18:29 /usr/local/lib/libjpeg.a
lrwxr-xr-x 1 root admin 20 1 Apr 18:29 /usr/local/lib/libjpeg.dylib ->
libjpeg.62.0.0.dylib
-rwxr-xr-x 1 sms admin 654 1 Apr 18:29 /usr/local/lib/libjpeg.la
Good Luck.
Cheers,
Steven Schultz
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