[ptx] longstanding & new problems/questions with 0.6

[Rich]

Daniel M. German wrote:
> Hi Rich,
> 
>  Rich> 1. tiff compression level field in sticher tab is disabled both for lzw 
>  Rich> & deflate compressions. seems strange.
> 
> Correct me if I am wrong, but TIFF lzw and deflate compressions are
> lossless and therefore cannot be parametrized. In other words, they do
> not support "compression level".

could they still not be controlled by passes, block size and such ?
bzip2 also is lossless (at least i hope so ;) ), but there is some 
control over compression level.

>  Rich> 4. building libpano & hugin on slackware still requires manually 
>  Rich> exporting -lm. i've whined about this countless times :)
> 
> What exactly do you mean by exporting -lm? Do you mean that the gcc
> link command does not include the -lm option? 

first, it turns out actually only libpano requires this now (i assumed 
hugin also does, as i exported it in the same session).
before running configure, i have to do :
export CFLAGS="-lm"
else it fails with :

checking if PNG package is complete... no -- some components failed test
configure: error:
         the png library must be installed on your system
         but configure could not find it.


from config.log :

configure:19692: checking for png_get_io_ptr in -lpng
configure:19722: gcc -o conftest -g -O2  -I/usr/include  -L/usr/lib 
conftest.c -lpng -lz  >&5
/usr/lib/libpng.so: undefined reference to `pow'

so, maybe libpano could just do whatever it is hugin package does ?
looking at "configure" script for hugin :
LIBS="-lpng -lz -lm $LIBS"

libpano has at most ;
LIBS="-ltiff -lz -ljpeg $LIBS"

> --
> Daniel M. German                  "Mathematics belong to God."
>                                    Donald Knuth
> http://turingmachine.org/
> http://silvernegative.com/
> dmg (at) uvic (dot) ca
> replace (at) with @ and (dot) with .
-- 
  Rich