First of all, note that the README instructions in 
tinyos-1.x/contrib/PEGSensor/README.PEGSensor
is incorrect.  In step 3.1, you type 

cd tinyos-1.x/contrib/PEGSensor/PEGSensor
make mica2dot
make mica2dot reinstall.0x200

Note that you are compiling in PEGSensor/PEGSensor.




If you cannot get PEGSensor to compile, and you get errors similar to the
errors found in the file PEGSensor_compile_failed.txt , it is likely that
you have multiple Config parameters with the same index number.  This can
happen because PEGSensor depends on the localization work in Calamari.  The
Calamari tree might be modified over time without testing whether the changes
are compatible with PEGSensor.

To resolve this, perform these steps:
1) comment out the unnecessary services.  For example, look at 
   PEGSensor_CVS_diff.txt on services that are unnecessary
2) Look in the autogenerated file build/Config.h to find the duplicate number
   entries.
   1) make mica2dot to generate the files in the build directory.  The 
      compilation will fail after creating Config.h
   2) open up Config.h in a text browser.  Note the numbers that are used
      multiple times (you may want to consult your compilation error messages
      and ConfigM.nc for help).
   3) grep recursively (grep -R "//!! Config number-in-conflict" *) 
      in the tinyos-1.x/contrib directory for the
      parameters that are conflicting.  Change the number in the line: 
		 //!! Config number-in-conflict
      of the corresponding *.nc file such that it is unique (check Config.h).
      Preferably, change the *.nc file in the PEGSensor directory, so as not 
      to screw up other projects.
   4) Save and recompile
   * As of 4/23/2004 the conflicts are:
     108:
       CONFIG_txRetry
       CONFIG_useWhichPosition # change this
     109:
       CONFIG_useEstimatedEvader # change this
       CONFIG_txDelay
3) Remember to change the matlab tools to match the change in config numbers
   (this does not affect compilation, but affects whether those config
    parameters are useable when you access them through matlab)
   1) Change peg.m's Config number to command mapping.  Search for the string
      'config_query(##)' in peg.m, where ## is the Config number
   2) Change peglistener.m's Config number to command mapping.  Search under
      the function 'ConfigResponse' and find the Config number in the
      case statement.



If you checked out recently from the CVS tree and get the error messages
similar to the file PEGSensor_compile_failed2.txt , Then a temporary fix is
to run these commands in your contrib/PEGSensor/PEGSensor directory:

mv /opt/tinyos-1.x/tos/system/Ident.h /opt/tinyos-1.x/tos/system/Ident.h.old
make mica2dot
mv /opt/tinyos-1.x/tos/system/Ident.h.old /opt/tinyos-1.x/tos/system/Ident.h