I had this problem as well. Apparently, the tar archive from web site is out of 
sync with repository, so I ended building it directly from repo. Here is the 
script:

git clone git://trousers.git.sourceforge.net/gitroot/trousers/trousers

cd trousers

sh bootstrap.sh

# the CFLAGS option is to prevent error with gcc-4.6.x
env CFLAGS="-Wno-unused-but-set-variable" ./configure

make



----- Original Message -----
> From: "Daniel F Mitchell" <[email protected]>
> To: "Joshua Phillips" <[email protected]>
> Cc: [email protected]
> Sent: Wednesday, January 25, 2012 10:36:18 AM
> Subject: Re: [TrouSerS-users] Issues installing tpm-tools on Ubuntu 11.10
> 
> Thanks for the answer, I got a similar response from another person
> on the list.  This does remove the error, but then I get another
> error:
> 
> /bin/bash ../../libtool --tag=CC   --mode=link gcc  -g -O2 -Wall
> -Werror -Wreturn-type -Wsign-compare   -o tpm_changeownerauth
> tpm_changeauth.o ../../lib/libtpm_tspi.la -ltspi
> libtool: link: gcc -g -O2 -Wall -Werror -Wreturn-type -Wsign-compare
> -o tpm_changeownerauth tpm_changeauth.o
>  ../../lib/.libs/libtpm_tspi.a -ldl -ltspi
> ../../lib/.libs/libtpm_tspi.a(tpm_tspi.o): In function
> `unloadNVDataPublic':
> tpm_tspi.c:(.text+0x11b1): undefined reference to
> `Trspi_UnloadBlob_NV_DATA_PUBLIC'
> tpm_tspi.c:(.text+0x11f4): undefined reference to
> `Trspi_UnloadBlob_NV_DATA_PUBLIC'
> collect2: ld returned 1 exit status
> 
> This seems like a linker error, does anyone know what I need to link?
> 
> Thanks again for all the help.
> 
> -----Original Message-----
> From: Joshua Phillips [mailto:[email protected]]
> Sent: Wednesday, January 25, 2012 10:22 AM
> To: Mitchell, Daniel F
> Cc: [email protected]
> Subject: Re: [TrouSerS-users] Issues installing tpm-tools on Ubuntu
> 11.10
> 
> On Wed, Jan 25, 2012 at 01:46:23PM +0000, Mitchell, Daniel F wrote:
> > Hello,
> > 
> > I recently tried to install tpm-tools 1.3.7.1 on Ubuntu 11.10.
> >  However, during make the process fails, giving the error:
> > 
> > tpm_unseal.c: In function 'tpmUnsealFile':
> > tpm_unseal.c:91:6: error: variable 'bioRc' set but not used
> > 
> > I created a bug tracker item for this, but I was wondering if
> > anyone had experienced similar issues, or maybe had a quick
> > resolution?
> > 
> > Thanks,
> > Dan
> 
> It looks like you're building with -Werror, which turns warnings
> (some
> of which can indicate bugs or dangerous pointer manipulations) into
> errors. An unused variable is not inherently harmful, so that error
> should be just a warning. Either:
> - add -Wno-error=unused-but-set-variable to CFLAGS to turn it into a
>   warning; or
> - remove -Werror from CFLAGS (or append -Wno-error) to continue
>   compiling despite warnings; or
> - use -Wno-unused-but-set-variable to disable that particular warning
>   entirely.
> 
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