On Wed, Oct 09, 2013 at 11:52:19PM +0200, Alan McKinnon wrote: > On 09/10/2013 23:41, José Romildo Malaquias wrote: > > Hello. > > > > I have installed the *binary distribution of scilab* available form its > > download page. > > > > About two months ago, I was using it without problems. > > > > Now it does not work anymore. Running the binary gives the following > > error message: > > > > $ /alt/scilab-5.4.1/bin/scilab > > scilab-bin: /alt/scilab-5.4.1/lib/thirdparty/libz.so.1: version > > `ZLIB_1.2.3.4' not found (required by /usr/lib64/libpng16.so.16) > > > > I need helping understanding this message and fixing this issue on my > > ~amd64 system. > > libpng16 is a library you already have on your system (not bundled with > scilab). And strangely, this *system* library is complaining that it > can't find the correct version of libz. These libs have names (sonames) > so you can tell different versions apart and use the right one. > > But the system libpng has no business trying to use a third party app > under any circumstances. And in fact in regular use it doesn't, see mine: > > $ ldd /usr/lib64/libpng16.so.16 > linux-vdso.so.1 (0x00007fff7d79a000) > libz.so.1 => /lib64/libz.so.1 (0x00007ff9ad6ab000) > libm.so.6 => /lib64/libm.so.6 (0x00007ff9ad3b5000) > libc.so.6 => /lib64/libc.so.6 (0x00007ff9ad00a000) > /lib64/ld-linux-x86-64.so.2 (0x00007ff9adb3c000) > > See? system libpng uses system libz. > > How does this happen? Easy. The authors of scilab are probably fiddling > with LD_LIBRARY_PATH, which just happens to be one of the more dangerous > things you can do in Unix. > > Go find the startup script for scilab and edit the mods to > LD_LIBRARY_PATH to put the scilab directory at the end (not the > beginning where it is now)
In fact the startup script for scilab sets LD_LIBRARY_PATH. Running it in verbose modes gives this information: $ SCIVERBOSE=1 /alt/scilab-5.4.1/bin/scilab SCILABBIN : scilab-bin DISABLE_JAVA_DETECTION : 0 SCILAB_MODE : gui OS : Linux MODEL : x86_64 IS_SCILAB_BINARY : 1 SCI : /alt/scilab-5.4.1/share/scilab SCIBIN : PATH : /alt/scilab-5.4.1/bin:/home/romildo/bin:/usr/local/bin:/usr/bin:/bin:/opt/bin:/usr/x86_64-pc-linux-gnu/gcc-bin/4.8.1:/usr/games/bin:/opt/vmware/bin:/alt/scilab-5.4.1/share/scilab/modules/scicos/ CLASSPATH : /alt/scilab-5.4.1/share/scilab/modules/core/jar/org.scilab.modules.core.jar LD_LIBRARY_PATH : /alt/scilab-5.4.1/thirdparty/java//lib/amd64/:/alt/scilab-5.4.1/thirdparty/java//lib/amd64/server/:/alt/scilab-5.4.1/thirdparty/java//lib/amd64/native_threads/:/alt/scilab-5.4.1/lib/scilab:/alt/scilab-5.4.1/lib/thirdparty:/alt/scilab-5.4.1/share/scilab/bin:/alt/scilab-5.4.1/share/scilab/lib/scilab/:/alt/scilab-5.4.1/share/scilab/lib64/scilab/:. scilab-bin: /alt/scilab-5.4.1/lib/thirdparty/libz.so.1: version `ZLIB_1.2.3.4' not found (required by /usr/lib64/libpng16.so.16) I will try to modify the script to put the scilab directory at the end. Romildo
