Chunks 1-3: Do not report contractions by default (local change).
Chunk 4: Do not use /usr/local/etc/ (local change).

Index: igor
--- igor.orig
+++ igor
@@ -104,7 +104,7 @@ usage: $prog -h
         -f  FreeBSD obsolete features
         -r  repeated words
         -s  spelling
-        -u  contractions
+        -u  contractions (off by default)
         -w  whitespace
         -y  style suggestions (off by default)
 
@@ -234,13 +234,13 @@ sub initialize {
 	# -D equals -abefgmprsuw
 	if ( $opt_D ) {
 		$opt_a = $opt_b = $opt_e = $opt_f = $opt_g = $opt_m = $opt_p
-			   = $opt_r = $opt_s = $opt_u = $opt_w = 1;
+			   = $opt_r = $opt_s = $opt_w = 1;
 	}
 
 	if ( $opt_z ) {
 		# all non-whitespace tests
 		$opt_a = $opt_b = $opt_c = $opt_d = $opt_e = $opt_f = $opt_g
-			   = $opt_m = $opt_o = $opt_p = $opt_r = $opt_s = $opt_u
+			   = $opt_m = $opt_o = $opt_p = $opt_r = $opt_s
 			   = $opt_E = $opt_S = 1;
 	}
 
@@ -263,7 +263,7 @@ sub initialize {
 		$opt_a = $opt_b = $opt_c = $opt_d = $opt_e
 			   = $opt_f = $opt_g = $opt_i = $opt_l = $opt_m
 			   = $opt_n = $opt_o = $opt_p = $opt_r = $opt_s
-			   = $opt_t = $opt_u = $opt_w = $opt_E = $opt_S
+			   = $opt_t = $opt_w = $opt_E = $opt_S
 			   = $opt_W = 1;
 		$opt_x = $opt_y = 0;
 	}
@@ -1017,8 +1017,8 @@ sub init_spellingerrors {
 	my @spellfiles;
 	# IGORSPELLFILES environment variable is a whitespace-separated list of files
 	push (@spellfiles, split /\s/, $ENV{'IGORSPELLFILES'}) if defined($ENV{'IGORSPELLFILES'});
-	# all files found in /usr/local/etc/igor/spelling
-	push (@spellfiles, split /\s/, `ls /usr/local/etc/igor/spelling/*`) if -d '/usr/local/etc/igor/spelling';
+	# all files found in /etc/igor/spelling
+	push (@spellfiles, split /\s/, `ls /etc/igor/spelling/*`) if -d '/etc/igor/spelling';
 	for my $spellfile (@spellfiles) {
 		readspelling($spellfile);
 	}