diff -ru gnustep-gui-0.24.0.orig/Source/GSCharacterPanel.m gnustep-gui-0.24.0/Source/GSCharacterPanel.m
--- gnustep-gui-0.24.0.orig/Source/GSCharacterPanel.m	2012-12-16 23:51:23.000000000 +0100
+++ gnustep-gui-0.24.0/Source/GSCharacterPanel.m	2021-08-16 20:39:11.913095999 +0200
@@ -78,7 +78,7 @@
 static UBool enumCharNamesFn(void *context, UChar32 code, UCharNameChoice nameChoice, const char *name, int32_t length)
 {
   [(NSMutableIndexSet*)context addIndex: (NSUInteger)code];
-  return TRUE;
+  return 1;
 }
 
 static NSIndexSet *AssignedCodepoints()
@@ -103,7 +103,7 @@
     {
       [ctx->set addIndex: (NSUInteger)code];
     }
-  return TRUE;
+  return 1;
 }
 
 static NSIndexSet *CodepointsWithNameContainingSubstring(NSString *str)
diff -ru gnustep-gui-0.24.0.orig/Source/NSBitmapImageRep+JPEG.m gnustep-gui-0.24.0/Source/NSBitmapImageRep+JPEG.m
--- gnustep-gui-0.24.0.orig/Source/NSBitmapImageRep+JPEG.m	2013-12-06 18:45:37.000000000 +0100
+++ gnustep-gui-0.24.0/Source/NSBitmapImageRep+JPEG.m	2021-08-16 20:39:51.238754691 +0200
@@ -149,7 +149,7 @@
   src->parent.next_input_byte = src->data;
   src->parent.bytes_in_buffer = src->length;
 
-  return TRUE;
+  return 1;
 }
 
 
@@ -278,7 +278,7 @@
   dest->pub.next_output_byte = dest->buffer;
   dest->pub.free_in_buffer = imageSize * cinfo->input_components;
 
-  return TRUE;
+  return 1;
 }
 
 /*
@@ -372,7 +372,7 @@
   /* Establish our own data source manager */
   gs_jpeg_memory_src_create(&cinfo, imageData);
 
-  jpeg_read_header(&cinfo, TRUE);
+  jpeg_read_header(&cinfo, 1);
   gs_jpeg_memory_src_destroy(&cinfo);
   jpeg_destroy_decompress(&cinfo);
 
@@ -427,7 +427,7 @@
   /* Establish our own data source manager */
   gs_jpeg_memory_src_create(&cinfo, imageData);
 
-  jpeg_read_header(&cinfo, TRUE);
+  jpeg_read_header(&cinfo, 1);
 
   /* we use RGB as target color space; others are not yet supported */
   cinfo.out_color_space = JCS_RGB;
@@ -622,8 +622,8 @@
 
   // compress the image
 
-  jpeg_set_quality (&cinfo, quality, TRUE);
-  jpeg_start_compress (&cinfo, TRUE);
+  jpeg_set_quality (&cinfo, quality, 1);
+  jpeg_start_compress (&cinfo, 1);
 
   if (isRGB && [self hasAlpha])	// strip alpha channel before encoding
     {
diff -ru gnustep-gui-0.24.0.orig/Source/win32-entry.c gnustep-gui-0.24.0/Source/win32-entry.c
--- gnustep-gui-0.24.0.orig/Source/win32-entry.c	2008-06-10 06:01:49.000000000 +0200
+++ gnustep-gui-0.24.0/Source/win32-entry.c	2021-08-16 20:39:15.659666577 +0200
@@ -77,5 +77,5 @@
 	{
 	}
 
-    return TRUE;
+    return 1;
 }