Can you run the command at the prompt?

What kind of error are you getting exactly?

/opt/BIPSConnect/bin/rdes: LD_LIBRARY_PATH=:/usr/lib:/usr/ucblib:/usr/
+openwin/lib:/usr/dt/lib:/usr/local/lib:/opt/hpnpl/lib:/p01cfg0
1/harvest/Harvest/lib:/opt/BIPSConnect/bin: is not an identifier
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Show us a code snippet.

#!/usr/bin/perl-w
use strict;
my $cmd_to_run = "/opt/BIPSConnect/bin/rdes";
my @results = `$cmd_to_run`;
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export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/opt/BIPSConnect/bin
/opt/BIPSConnect/bin/micn_cr2k_bips_test_console /home/w951an6/perl/ph
+ase_II/xxx.xml
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Update: I saw your reply at Re: Re: Running a C Program within Perl.. What command are you trying to run (are your getting a "no such file or Directory" type error and then trying to treat that as valid output)?

Cannot offer more help without more information: what platform are you running on? what is the expected output of your C program? what does your perl program do with that output; etc. ???