anchor.diff:  
   * *OSCAP_FULL_VALIDATION=1* - validate all exported documents (slower)
   * *SEXP_VALIDATE_DISABLE=1* - do not validate SEXP expressions (faster)
  -* *OSCAP_DEBUG_FILE="foo"* - name for debug files
  -* *OSCAP_DEBUG_LEVEL=2* - set verbosity in debug logs
  -** ```1``` for Errors
  -** ```2``` for Errors & Warnings
  -** ```3``` for Errors & Warnings & Info messages
   
   
   
  
positive.code: Debug mode provides:
  
  * debug symbols on and optimization off - you can use ```gdb```,
  * logs - ```oscap``` tool will generate *oscap_debug.log.\{pid}* log files for
  every process that was run.
  * http://www.gnu.org/software/gawk/manual/html_node/Assert-Function.html[assertions]
  are evaluated.
  
  ==== Testing library
  Next important step is to ```preload libopenscap_testing.so``` before you run
   ```oscap``` tool. The testing library allows you to specify custom path to
  probes via *OVAL_PROBE_DIR* environment variable. The easiest way how to
  achieve that without need to install libopenscap, is to use shell
  
negative.code: 
  The *run* script is generated at configure time and it sets:
  
  * *LD_PRELOAD* and *LD_LIBRARY_PATH* - preload ```libopenscap_testing.so```
  * *OVAL_PROBE_DIR* - path to probes
  * *OSCAP_SCHEMA_PATH* - path to XCCDF, OVAL, CPE, ... schemas. (required
  for valudation)
  