--- ./src/dfa.c.orig	2004-10-20 02:13:43.000000000 +0900
+++ ./src/dfa.c	2004-10-20 02:14:14.000000000 +0900
@@ -658,6 +658,29 @@
 	  REALLOC_IF_NECESSARY(work_mbc->range_ends, wchar_t,
 			       range_ends_al, work_mbc->nranges + 1);
 	  work_mbc->range_ends[work_mbc->nranges++] = (wchar_t)wc2;
+	  if (case_fold 
+	      && (iswlower((wint_t)wc) || iswupper((wint_t)wc))
+	      && (iswlower((wint_t)wc2) || iswupper((wint_t)wc2))) {
+	    wint_t altcase;
+	    altcase = wc;
+	    if (iswlower((wint_t)wc))
+	      altcase = towupper((wint_t)wc);
+	    else
+	      altcase = towlower((wint_t)wc);
+	    REALLOC_IF_NECESSARY(work_mbc->range_sts, wchar_t,
+				 range_sts_al, work_mbc->nranges + 1);
+	    work_mbc->range_sts[work_mbc->nranges] = (wchar_t)altcase;
+	    
+	    altcase = wc2;
+	    if (iswlower((wint_t)wc2))
+	      altcase = towupper((wint_t)wc2);
+	    else
+	      altcase = towlower((wint_t)wc2);
+	    REALLOC_IF_NECESSARY(work_mbc->range_ends, wchar_t,
+				 range_ends_al, work_mbc->nranges + 1);
+	    work_mbc->range_ends[work_mbc->nranges++] = (wchar_t)altcase;
+	    
+	  }
 	}
       else if (wc != WEOF)
 	/* build normal characters.  */