From Kees Cook, Debian BTS #505734

--- boost1.37-1.37.0.orig/tools/jam/src/compile.c
+++ boost1.37-1.37.0/tools/jam/src/compile.c
@@ -1404,7 +1404,7 @@
       i = (level+1)*2;
       while ( i > 35 )
       {
-        printf( indent );
+        printf( "%s", indent );
         i -= 35;
       }
 
--- boost1.37-1.37.0.orig/tools/jam/src/make1.c
+++ boost1.37-1.37.0/tools/jam/src/make1.c
@@ -1018,7 +1018,7 @@
 			list_sublist( ns, start, chunk ),
 			list_new( L0, newstr( "%" ) ) );
 
-                    printf( cmd->buf );
+                    printf( "%s", cmd->buf );
                 
 		    exit( EXITBAD );
 		}
--- boost1.37-1.37.0.orig/tools/jam/src/output.c
+++ boost1.37-1.37.0/tools/jam/src/output.c
@@ -20,7 +20,7 @@
     while ( *data )
     {
         size_t len = strcspn(data,"\r");
-        fwrite(data,len,1,io);
+        do { if (fwrite(data,len,1,io)) {} } while (0);
         data += len;
         if ( *data == '\r' ) ++data;
     }
--- boost1.37-1.37.0.orig/tools/jam/src/variable.c
+++ boost1.37-1.37.0/tools/jam/src/variable.c
@@ -416,8 +416,18 @@
         }
         if ( output_0 < output_1 )
         {
-            if ( out_file ) fwrite(output_0,output_1-output_0,1,out_file);
-            if ( out_debug ) fwrite(output_0,output_1-output_0,1,stdout);
+            if ( out_file ) {
+                if ( fwrite(output_0,output_1-output_0,1,out_file) < 1 ) {
+                    printf( "failed to write output file!\n" );
+                    exit( EXITBAD );
+                }
+            }
+            if ( out_debug ) {
+                if ( fwrite(output_0,output_1-output_0,1,stdout) < 1 ) {
+                    printf( "failed to write output to stdout!\n" );
+                    exit( EXITBAD );
+                }
+            }
         }
         output_0 = output_1;
 
@@ -457,8 +467,18 @@
         }
         else if ( output_0 < output_1 )
         {
-            if ( out_file ) fwrite(output_0,output_1-output_0,1,out_file);
-            if ( out_debug ) fwrite(output_0,output_1-output_0,1,stdout);
+            if ( out_file ) {
+                if ( fwrite(output_0,output_1-output_0,1,out_file) < 1 ) {
+                    printf( "failed to write output file!\n" );
+                    exit( EXITBAD );
+                }
+            }
+            if ( out_debug ) {
+                if ( fwrite(output_0,output_1-output_0,1,stdout) < 1 ) {
+                    printf( "failed to write output to stdout!\n" );
+                    exit( EXITBAD );
+                }
+            }
         }
         
         in = output_1;