Thank you very much Nicolás,
In this particular case - Slackware with OpenSSL 0.9.7(g), the command needed was:
ln -s /usr/lib/libcrypto.so.0.9.7 /usr/lib/libcrypto.so.4
that solved libcrypto library load problem. However, I have a new - and seemingly more difficult - problem. Now Filter::Crypto::Decrypt is detecting the Perl debugger as active in Slackware's Perl binary:
./fop2_server
Debugging flag values: (see also -d)
[ Long list of debugging parameters clipped off ]
Can't run with DEBUGGING Perl at /usr/lib/perl5/5.8.5/i386-linux-thread-multi/DynaLoader.pm line 253.
BEGIN failed--compilation aborted at /tmp/par-root/cache-f0a3f11efb4858d29f477772e1bc9d218df72f95/inc/lib/Filter/Crypto/Decrypt.pm line 37.
Compilation failed in require at script/fop2_server.pl line 1.
BEGIN failed--compilation aborted at script/fop2_server.pl line 1.
Strangely, and as far as I remember, Slackware's Perl does not ship with debugging. The original makefile compilation parameters for this package version were:
./Configure -de
-Dprefix=/usr
-Dcccdlflags='-fPIC'
-Dinstallprefix=/usr
-Doptimize="-O2 -march=i486 -mcpu=i686"
-Dinc_version_list='5.8.6 5.8.5 5.8.4 5.8.3 5.8.2 5.8.1 5.8.0'
-Darchname=i486-linux
Output of perl -V:
perl -V
Summary of my perl5 (revision 5 version 8 subversion 7) configuration:
Platform:
osname=linux, osvers=2.4.31, archname=i486-linux
uname='linux midas 2.4.31 #6 sun jun 5 19:04:47 pdt 2005 i686 unknown unknown gnulinux '
config_args='-de -Dprefix=/usr -Dcccdlflags=-fPIC -Dinstallprefix=/usr -Doptimize=-O2 -march=i486 -mcpu=i686 -Dinc_version_list=5.8.6 5.8.5 5.8.4 5.8.3 5.8.2 5.8.1 5.8.0 -Darchname=i486-linux'
hint=recommended, useposix=true, d_sigaction=define
usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
use64bitint=undef use64bitall=undef uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler:
cc='cc', ccflags ='-fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
optimize='-O2 -march=i486 -mcpu=i686',
cppflags='-fno-strict-aliasing -pipe -I/usr/local/include'
ccversion='', gccversion='3.3.6', gccosandvers=''
intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
alignbytes=4, prototype=define
Linker and Libraries:
ld='cc', ldflags =' -L/usr/local/lib'
libpth=/usr/local/lib /lib /usr/lib
libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc
perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc
libc=/lib/libc-2.3.5.so, so=so, useshrplib=false, libperl=libperl.a
gnulibc_version='2.3.5'
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib'
Characteristics of this binary (from libperl):
Compile-time options: USE_LARGE_FILES
Built under linux
Compiled at Jul 13 2005 12:02:22
@INC:
/usr/lib/perl5/5.8.7/i486-linux
/usr/lib/perl5/5.8.7
/usr/lib/perl5/site_perl/5.8.7/i486-linux
/usr/lib/perl5/site_perl/5.8.7
/usr/lib/perl5/site_perl/5.8.6
/usr/lib/perl5/site_perl