https://www.boost.org/doc/libs/1_85_0/libs/filesystem/doc/deprecated.html
--- a/src/cmdline.cpp
+++ b/src/cmdline.cpp
@@ -41,7 +41,6 @@
 #include <iostream>
 
 #include <boost/filesystem/operations.hpp>
-#include <boost/filesystem/convenience.hpp>
 
 #include <tiff.h>
 
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -41,7 +41,6 @@
 
 #include <boost/filesystem/path.hpp>
 #include <boost/filesystem/operations.hpp>
-#include <boost/filesystem/convenience.hpp>
 
 extern "C"
 {
@@ -172,10 +171,10 @@ int main( int argc, char *argv[] )
             if (pathOutFileName.string().length()) {
               // A fixed name was given, so use it as a base name
               outPath = pathOutFileName;
-              std::string orgExt = fs::extension(outPath);
+              std::string orgExt = outPath.extension().string();
               if (nFileCountOut > 1) {
                 sprintf(acNumber, "_%03d", nPage+1);
-                outPath = fs::change_extension(outPath, acNumber);
+                outPath.replace_extension(acNumber);
                 if (orgExt.length()) {
                   std::string strTemp = outPath.string();
                   strTemp += orgExt;
@@ -184,15 +183,15 @@ int main( int argc, char *argv[] )
               }
             } else {
               // Otherwise construct output filename from input filename
-              outPath = pathOutDirectory / pathInFileName.leaf();
+              outPath = pathOutDirectory / pathInFileName.filename();
               if (nFileCountOut > 1) {
                 sprintf(acNumber, "_%03d", nPage+1);
-                outPath = fs::change_extension(outPath, acNumber);
+                outPath.replace_extension(acNumber);
                 std::string strTemp = outPath.string();
                 strTemp += pOut->GetExtension();
                 outPath = fs::path(strTemp);
               } else {
-                outPath = fs::change_extension(outPath, pOut->GetExtension());
+                outPath.replace_extension(pOut->GetExtension());
               }
             }
             if (!proc.doOverwrite() && !((nPage > 0) && (nFileCountOut == 1)) && fs::exists(outPath)) {
--- a/src/output.cpp
+++ b/src/output.cpp
@@ -42,7 +42,6 @@
 #include <iostream>
 
 #include <boost/filesystem/path.hpp>
-#include <boost/filesystem/convenience.hpp>
 
 #ifdef WIN32
 #include <io.h>