diff --git a/Source/NSString.m b/Source/NSString.m
index 9ee90d5fa..b76c39108 100644
--- a/Source/NSString.m
+++ b/Source/NSString.m
@@ -662,6 +662,7 @@ GSICUCollatorOpen(NSStringCompareOptions mask, NSLocale *locale)
   return NULL;
 }
 
+#if defined(HAVE_UNICODE_UNORM2_H)
 - (NSString *) _normalizedICUStringOfType: (const char*)normalization
                                      mode: (UNormalization2Mode)mode
 {
@@ -750,6 +751,7 @@ GSICUCollatorOpen(NSStringCompareOptions mask, NSLocale *locale)
   return AUTORELEASE(newString);
 }
 #endif
+#endif
 
 + (void) atExit
 {
@@ -1769,7 +1771,7 @@ GSICUCollatorOpen(NSStringCompareOptions mask, NSLocale *locale)
 
 - (NSString *) decomposedStringWithCompatibilityMapping
 {
-#if GS_USE_ICU == 1
+#if (GS_USE_ICU == 1) && defined(HAVE_UNICODE_UNORM2_H)
   return [self _normalizedICUStringOfType: "nfkc" mode: UNORM2_DECOMPOSE];
 #else
   return [self notImplemented: _cmd];
@@ -1778,7 +1780,7 @@ GSICUCollatorOpen(NSStringCompareOptions mask, NSLocale *locale)
 
 - (NSString *) decomposedStringWithCanonicalMapping
 {
-#if GS_USE_ICU == 1
+#if (GS_USE_ICU == 1) && defined(HAVE_UNICODE_UNORM2_H)
   return [self _normalizedICUStringOfType: "nfc" mode: UNORM2_DECOMPOSE];
 #else
   return [self notImplemented: _cmd];
@@ -3931,7 +3933,7 @@ static NSFileManager *fm = nil;
 
 - (NSString *) precomposedStringWithCompatibilityMapping
 {
-#if GS_USE_ICU == 1
+#if (GS_USE_ICU == 1) && defined(HAVE_UNICODE_UNORM2_H)
   return [self _normalizedICUStringOfType: "nfkc" mode: UNORM2_COMPOSE];
 #else
   return [self notImplemented: _cmd];
@@ -3940,7 +3942,7 @@ static NSFileManager *fm = nil;
  
 - (NSString *) precomposedStringWithCanonicalMapping
 {
-#if GS_USE_ICU == 1
+#if (GS_USE_ICU == 1) && defined(HAVE_UNICODE_UNORM2_H)
    return [self _normalizedICUStringOfType: "nfc" mode: UNORM2_COMPOSE];
 #else
   return [self notImplemented: _cmd];
diff --git a/configure b/configure
index 82ad600e0..b9acd88c0 100755
--- a/configure
+++ b/configure
@@ -26090,7 +26090,8 @@ $as_echo "yes" >&6; }
 
 
 
-for ac_header in unicode/uloc.h unicode/ulocdata.h unicode/ucol.h unicode/ucurr.h unicode/uregex.h unicode/ucal.h unicode/unum.h unicode/udat.h unicode/udatpg.h unicode/ustring.h unicode/usearch.h unicode/unorm2.h
+
+for ac_header in unicode/uloc.h unicode/ulocdata.h unicode/ucol.h unicode/ucurr.h unicode/uregex.h unicode/ucal.h unicode/unorm2.h unicode/unum.h unicode/udat.h unicode/udatpg.h unicode/ustring.h unicode/usearch.h unicode/unorm2.h
 do
 as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 if { as_var=$as_ac_Header; eval "test \"\${$as_var+set}\" = set"; }; then
diff --git a/configure.ac b/configure.ac
index 720a5d61d..e0ecd833d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3204,7 +3204,7 @@ if test $enable_icu = yes; then
     
   if test "$have_icu" = "yes"; then
     AC_MSG_RESULT(yes)
-    AC_CHECK_HEADERS(unicode/uloc.h unicode/ulocdata.h unicode/ucol.h unicode/ucurr.h unicode/uregex.h unicode/ucal.h unicode/unum.h unicode/udat.h unicode/udatpg.h unicode/ustring.h unicode/usearch.h unicode/unorm2.h)
+    AC_CHECK_HEADERS(unicode/uloc.h unicode/ulocdata.h unicode/ucol.h unicode/ucurr.h unicode/uregex.h unicode/ucal.h unicode/unorm2.h unicode/unum.h unicode/udat.h unicode/udatpg.h unicode/ustring.h unicode/usearch.h unicode/unorm2.h)
     LIBS="$LIBS $ICU_LIBS"
     LDFLAGS="$LDFLAGS $ICU_LDFLAGS"
     LDIR_FLAGS="$LDIR_FLAGS $ICU_LDFLAGS"