[Geotiff] libgeotiff.so requiring libtiff.so.3

[Dan Homerick]

On my system (Ubuntu, Feisty Fawn release) the current libtiff shared
library is pointed to by libtiff.so.4 and there's no libtiff.so.3 present.
My version of libtiff is listed as 3.8.2-6.

When I try to build an application using the libgeotiff.so library, I get
the error message below during the linking phase. I don't get any errors if
I use the static version, libgeotiff.a.

I'm still somewhat new to Linux, and program development in general... is
the apparent lack of upward compatibility with the libtiff library a bug or
just the nature of shared libraries? Incidentally, creating a symbolic link
to the current libtiff:

cd /usr/lib
ln -s libtiff.so.4.2.1 libtiff.so.3

(probably I bad idea, but I thought I'd try it)
removes some, but not all error messages.

Error messsage without libtiff.so.3 present:
/usr/bin/ld: warning: libtiff.so.3, needed by /usr/local/lib/libgeotiff.so,
not found (try using -rpath or -rpath-link)
/usr/local/lib/libgeotiff.so: undefined reference to `_TIFFmemcpy'
/usr/local/lib/libgeotiff.so: undefined reference to `_TIFFsetShortArray'
/usr/local/lib/libgeotiff.so: undefined reference to `_TIFFMergeFieldInfo'
/usr/local/lib/libgeotiff.so: undefined reference to `TIFFSetField'
/usr/local/lib/libgeotiff.so: undefined reference to `_TIFFmemset'
/usr/local/lib/libgeotiff.so: undefined reference to `TIFFClose'
/usr/local/lib/libgeotiff.so: undefined reference to `TIFFGetField'
/usr/local/lib/libgeotiff.so: undefined reference to `TIFFSetTagExtender'
/usr/local/lib/libgeotiff.so: undefined reference to `_TIFFFieldWithTag'
/usr/local/lib/libgeotiff.so: undefined reference to `_TIFFfree'
/usr/local/lib/libgeotiff.so: undefined reference to `TIFFFdOpen'
/usr/local/lib/libgeotiff.so: undefined reference to `_TIFFmalloc'
/usr/local/lib/libgeotiff.so: undefined reference to `_TIFFsetString'
/usr/local/lib/libgeotiff.so: undefined reference to `TIFFOpen'
/usr/local/lib/libgeotiff.so: undefined reference to `_TIFFprintAsciiTag'
/usr/local/lib/libgeotiff.so: undefined reference to `_TIFFrealloc'
/usr/local/lib/libgeotiff.so: undefined reference to `_TIFFsetDoubleArray'
collect2: ld returned 1 exit status

Error message with libtiff.so.3 pointing to libtiff.so.4.2.1:
/usr/local/lib/libgeotiff.so: undefined reference to `_TIFFMergeFieldInfo'
/usr/local/lib/libgeotiff.so: undefined reference to `_TIFFFieldWithTag'
collect2: ld returned 1 exit status
make[2]: *** [Test_CldTextToImageConverter] Error 1
make[1]: *** [CMakeFiles/Test_CldTextToImageConverter.dir/all] Error 2
make: *** [all] Error 2
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