Follow hint of Fabian Klötzl <kloetzl@evolbio.mpg.de>

 							uint pos=matchPos[o];

 							c= seqData[j+pos];

 							w|=(unsigned long long) alphabet[c] << bits;

--- a/src/patternset.cpp

+++ b/src/patternset.cpp

@@ -184,17 +184,6 @@ void patternset::ReInit(){

  * Checks, if bitmode is possible.

  */

 void patternset::CheckParams(){

-	if(size < 0){

-		size = std::abs(size);

-		if(size <= 0){

-			size = 10;

-			update = true;

-		}

-	}

-	if(max_dontcare < 0 || min_dontcare < 0){

-		max_dontcare = std::abs(max_dontcare);

-		min_dontcare = std::abs(min_dontcare);

-	}

 	if(max_dontcare < min_dontcare){

 		std::swap(max_dontcare,min_dontcare);

 	}