It may become necessary to debug libcapi20. Debian builds the package without
debug information for performance reasons.  Below patch will compile the
library with debug information.

diff --git a/capi20/capi20.c b/capi20/capi20.c
index ab8c1c6..81b5c5c 100644
--- a/capi20/capi20.c
+++ b/capi20/capi20.c
@@ -61,7 +61,7 @@ static int tracelevel;
 static char *tracefile;

 /** debug level, for debugging purpose */
-static int nDebugLevel = 0;
+static int nDebugLevel = 0xFFFF;

 /**
  * \brief CapiDebug output functions