diff --git a/avrdude/ChangeLog b/avrdude/ChangeLog
index 48696e6d..75e24259 100644
--- a/avrdude/ChangeLog
+++ b/avrdude/ChangeLog
@@ -1,3 +1,12 @@
+2012-11-04  Rene Liebscher <R.Liebscher@gmx.de>
+
+	* lexer.l,config_gram.y,config.[hc]: changed reading of numbers to integers
+	        except of default_bitclock which is the only real number.
+	        No signs are allowed as negative values do not make sense for current
+	        config values.
+	* buspirate.c: include own header file buspirate.h
+	* doc/.cvsignore: add programmers.texi to ignore list
+
 2012-09-06  Joerg Wunsch <j.gnu@uriah.heep.sax.de>
 
 	* doc/Makefile.am: add EXTRA_DIST, replace $(srcdir) by
diff --git a/avrdude/avrdude.conf.in b/avrdude/avrdude.conf.in
index 910d5899..4335b63e 100644
--- a/avrdude/avrdude.conf.in
+++ b/avrdude/avrdude.conf.in
@@ -326,7 +326,7 @@
 #
 default_parallel   = "@DEFAULT_PAR_PORT@";
 default_serial     = "@DEFAULT_SER_PORT@";
-# default_bitclock = 2.5
+# default_bitclock = 2.5;
 
 
 #
diff --git a/avrdude/buspirate.c b/avrdude/buspirate.c
index cf12d76c..2c50b15b 100644
--- a/avrdude/buspirate.c
+++ b/avrdude/buspirate.c
@@ -50,6 +50,7 @@
 #include "avr.h"
 #include "pgm.h"
 #include "serial.h"
+#include "buspirate.h"
 
 /* ====== Private data structure ====== */
 /* CS and AUX pin bitmasks in
diff --git a/avrdude/config.c b/avrdude/config.c
index 7da6531c..3472dfc8 100644
--- a/avrdude/config.c
+++ b/avrdude/config.c
@@ -122,7 +122,7 @@ void free_token(TOKEN * tkn)
         tkn->value.string = NULL;
         break;
     }
-    
+
     free(tkn);
   }
 }
@@ -149,15 +149,29 @@ TOKEN * number(char * text)
 
   tkn = new_token(TKN_NUMBER);
   tkn->value.type   = V_NUM;
-  tkn->value.number = atof(text);
+  tkn->value.number = atoi(text);
 
 #if DEBUG
-  fprintf(stderr, "NUMBER(%g)\n", tkn->value.number);
+  fprintf(stderr, "NUMBER(%d)\n", tkn->value.number);
 #endif
 
   return tkn;
 }
 
+TOKEN * number_real(char * text)
+{
+  struct token_t * tkn;
+
+  tkn = new_token(TKN_NUMBER);
+  tkn->value.type   = V_NUM_REAL;
+  tkn->value.number_real = atof(text);
+
+#if DEBUG
+  fprintf(stderr, "NUMBER(%g)\n", tkn->value.number_real);
+#endif
+
+  return tkn;
+}
 
 TOKEN * hexnumber(char * text)
 {
@@ -223,16 +237,20 @@ void print_token(TOKEN * tkn)
 
   fprintf(stderr, "token = %d = ", tkn->primary);
   switch (tkn->value.type) {
-    case V_NUM: 
-      fprintf(stderr, "NUMBER, value=%g", tkn->value.number); 
+    case V_NUM:
+      fprintf(stderr, "NUMBER, value=%d", tkn->value.number);
       break;
 
-    case V_STR: 
-      fprintf(stderr, "STRING, value=%s", tkn->value.string); 
+    case V_NUM_REAL:
+      fprintf(stderr, "NUMBER, value=%g", tkn->value.number_real);
       break;
 
-    default: 
-      fprintf(stderr, "<other>"); 
+    case V_STR:
+      fprintf(stderr, "STRING, value=%s", tkn->value.string);
+      break;
+
+    default:
+      fprintf(stderr, "<other>");
       break;
   }
 
diff --git a/avrdude/config.h b/avrdude/config.h
index 13566413..09d73cbb 100644
--- a/avrdude/config.h
+++ b/avrdude/config.h
@@ -29,11 +29,14 @@
 
 #define MAX_STR_CONST 1024
 
-enum { V_NONE, V_NUM, V_STR };
+enum { V_NONE, V_NUM, V_NUM_REAL, V_STR };
 typedef struct value_t {
   int      type;
-  double   number;
-  char   * string;
+  /*union { TODO: use an anonymous union here ? */
+    int      number;
+    double   number_real;
+    char   * string;
+  /*};*/
 } VALUE;
 
 
@@ -91,6 +94,8 @@ void free_tokens(int n, ...);
 
 TOKEN * number(char * text);
 
+TOKEN * number_real(char * text);
+
 TOKEN * hexnumber(char * text);
 
 TOKEN * string(char * text);
diff --git a/avrdude/config_gram.y b/avrdude/config_gram.y
index d4fa3511..8145ff83 100644
--- a/avrdude/config_gram.y
+++ b/avrdude/config_gram.y
@@ -200,12 +200,24 @@ static int pin_name;
 %token TKN_SEMI
 %token TKN_TILDE
 %token TKN_NUMBER
+%token TKN_NUMBER_REAL
 %token TKN_STRING
 
 %start configuration
 
 %%
 
+number_real : 
+ TKN_NUMBER {
+    $$ = $1;
+    /* convert value to real */
+    $$->value.number_real = $$->value.number;
+    $$->value.type = V_NUM_REAL;
+  } |
+  TKN_NUMBER_REAL {
+    $$ = $1;
+  }
+
 configuration :
   /* empty */ | config
 ;
@@ -239,8 +251,8 @@ def :
     free_token($3);
   } |
 
-  K_DEFAULT_BITCLOCK TKN_EQUAL TKN_NUMBER TKN_SEMI {
-    default_bitclock = $3->value.number;
+  K_DEFAULT_BITCLOCK TKN_EQUAL number_real TKN_SEMI {
+    default_bitclock = $3->value.number_real;
     free_token($3);
   }
 ;
diff --git a/avrdude/doc/.cvsignore b/avrdude/doc/.cvsignore
index 99f4eabd..afe95fe9 100644
--- a/avrdude/doc/.cvsignore
+++ b/avrdude/doc/.cvsignore
@@ -22,3 +22,4 @@ texinfo.tex
 version.texi
 programmer_types.texi
 parts.texi
+programmers.texi
diff --git a/avrdude/lexer.l b/avrdude/lexer.l
index 255ae941..06440969 100644
--- a/avrdude/lexer.l
+++ b/avrdude/lexer.l
@@ -57,9 +57,12 @@ SIGN     [+-]
 
 %%
 
-{SIGN}*{DIGIT}+            { yylval = number(yytext); return TKN_NUMBER; }
-{SIGN}*{DIGIT}+"."{DIGIT}* { yylval = number(yytext); return TKN_NUMBER; }
-{SIGN}*"."{DIGIT}*         { yylval = number(yytext); return TKN_NUMBER; }
+#{SIGN}*{DIGIT}+            { yylval = number(yytext); return TKN_NUMBER; }
+#{SIGN}*{DIGIT}+"."{DIGIT}* { yylval = number_real(yytext); return TKN_NUMBER_REAL; }
+#{SIGN}*"."{DIGIT}*         { yylval = number_real(yytext); return TKN_NUMBER_REAL; }
+{DIGIT}+            { yylval = number(yytext); return TKN_NUMBER; }
+{DIGIT}+"."{DIGIT}* { yylval = number_real(yytext); return TKN_NUMBER_REAL; }
+"."{DIGIT}+         { yylval = number_real(yytext); return TKN_NUMBER_REAL; }
 
 "\""      { string_buf_ptr = string_buf; BEGIN(strng); }