https://sourceforge.net/p/graphicsmagick/code/ci/ffe38e523f547a43219c8cdefc01c51fa4b51671/

--- a/coders/url.c
+++ b/coders/url.c
@@ -52,12 +52,19 @@
 #    include <win32config.h>
 #  endif
 #endif
+#include <libxml/xmlversion.h>
 #include <libxml/parser.h>
 #include <libxml/xmlmemory.h>
-#if defined(HAVE_XMLNANOFTPNEWCTXT) && HAVE_XMLNANOFTPNEWCTXT
-#  include <libxml/nanoftp.h>
-#endif /* defined(HAVE_XMLNANOFTPNEWCTXT) && HAVE_XMLNANOFTPNEWCTXT */
-#include <libxml/nanohttp.h>
+#if defined(LIBXML_FTP_ENABLED)
+#  if defined(HAVE_XMLNANOFTPNEWCTXT) && HAVE_XMLNANOFTPNEWCTXT
+#    include <libxml/nanoftp.h>
+#  endif /* defined(HAVE_XMLNANOFTPNEWCTXT) && HAVE_XMLNANOFTPNEWCTXT */
+#endif /* if defined(LIBXML_FTP_ENABLED) */
+#if defined(LIBXML_HTTP_ENABLED)
+#  if defined(HAVE_XMLNANOHTTPOPEN) && HAVE_XMLNANOHTTPOPEN
+#    include <libxml/nanohttp.h>
+#  endif /* defined(HAVE_XMLNANOHTTPOPEN) && HAVE_XMLNANOHTTPOPEN */
+#endif /* if defined(LIBXML_HTTP_ENABLED) */
 
 /*
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -95,6 +102,7 @@
 extern "C" {
 #endif
 
+#if defined(LIBXML_FTP_ENABLED)
 #if defined(HAVE_XMLNANOFTPNEWCTXT) && HAVE_XMLNANOFTPNEWCTXT
 static void GetFTPData(void *userdata,const char *data,int length)
 {
@@ -109,6 +117,7 @@
   (void) fwrite(data,length,1,file);
 }
 #endif /* if defined(HAVE_XMLNANOFTPNEWCTXT) && HAVE_XMLNANOFTPNEWCTXT */
+#endif /* if defined(LIBXML_FTP_ENABLED) */
 
 #if defined(__cplusplus) || defined(c_plusplus)
 }
@@ -175,6 +184,7 @@
         }
       if (LocaleCompare(clone_info->magick,"http") == 0)
         {
+#if defined(LIBXML_HTTP_ENABLED)
 #if defined(HAVE_XMLNANOHTTPOPEN) && HAVE_XMLNANOHTTPOPEN
           char
             buffer[MaxBufferExtent];
@@ -199,9 +209,11 @@
               xmlNanoHTTPCleanup();
             }
 #endif /* if defined(HAVE_XMLNANOHTTPOPEN) && HAVE_XMLNANOHTTPOPEN */
+#endif /* if defined(LIBXML_FTP_ENABLED) */
         }
       else if (LocaleCompare(clone_info->magick,"ftp") == 0)
         {
+#if defined(LIBXML_FTP_ENABLED)
 #if defined(HAVE_XMLNANOFTPNEWCTXT) && HAVE_XMLNANOFTPNEWCTXT
           void
             *context;
@@ -216,6 +228,7 @@
               (void) xmlNanoFTPClose(context);
             }
 #endif /* if defined(HAVE_XMLNANOFTPNEWCTXT) && HAVE_XMLNANOFTPNEWCTXT */
+#endif /* if defined(LIBXML_FTP_ENABLED) */
         }
       (void) fclose(file);
       if (!IsAccessibleAndNotEmpty(clone_info->filename))
@@ -264,6 +277,8 @@
   MagickInfo
     *entry;
 
+  /* HTTP URLs are not encouraged on the Internet */
+#if defined(LIBXML_HTTP_ENABLED)
 #if defined(HAVE_XMLNANOHTTPOPEN) && HAVE_XMLNANOHTTPOPEN
   entry=SetMagickInfo("HTTP");
   entry->decoder=(DecoderHandler) ReadURLImage;
@@ -273,7 +288,10 @@
   entry->coder_class=UnstableCoderClass;
   (void) RegisterMagickInfo(entry);
 #endif /* if defined(HAVE_XMLNANOHTTPOPEN) && HAVE_XMLNANOHTTPOPEN */
+#endif /* if defined(LIBXML_HTTP_ENABLED) */
 
+  /* FTP URLs have been deprecated for quite some time already */
+#if defined(LIBXML_FTP_ENABLED)
 #if defined(HAVE_XMLNANOFTPNEWCTXT) && HAVE_XMLNANOFTPNEWCTXT
   entry=SetMagickInfo("FTP");
   entry->decoder=(DecoderHandler) ReadURLImage;
@@ -283,6 +301,7 @@
   entry->coder_class=UnstableCoderClass;
   (void) RegisterMagickInfo(entry);
 #endif /* if defined(HAVE_XMLNANOFTPNEWCTXT) && HAVE_XMLNANOFTPNEWCTXT */
+#endif /* if defined(LIBXML_FTP_ENABLED) */
 
   entry=SetMagickInfo("FILE");
   entry->decoder=(DecoderHandler) ReadURLImage;