Bug: https://bugs.gentoo.org/955553
Based on: https://gitlab.archlinux.org/archlinux/packaging/packages/prusa-slicer/-/blob/main/boost-1.88.patch

--- a/src/libslic3r/GCode/PostProcessor.cpp
+++ b/src/libslic3r/GCode/PostProcessor.cpp
@@ -152,7 +152,14 @@ static int run_script(const std::string &script, const std::string &gcode, std::
 
 #include <cstdlib>   // getenv()
 #include <sstream>
+#if BOOST_VERSION >= 108800 // v2 is now default
+#define BOOST_PROCESS_VERSION 1
+#include <boost/process/v1/child.hpp>
+#include <boost/process/v1/io.hpp>
+#include <boost/process/v1/pipe.hpp>
+#else
 #include <boost/process.hpp>
+#endif
 
 namespace process = boost::process;
 
--- a/src/slic3r/GUI/RemovableDriveManager.cpp
+++ b/src/slic3r/GUI/RemovableDriveManager.cpp
@@ -35,8 +35,16 @@
 #include <pwd.h>
 #include <boost/filesystem.hpp>
 #include <boost/system/error_code.hpp>
+#if BOOST_VERSION >= 108800 // v2 is now default
+#define BOOST_PROCESS_VERSION 1
+#include <boost/process/v1/child.hpp>
+#include <boost/process/v1/io.hpp>
+#include <boost/process/v1/pipe.hpp>
+#include <boost/process/v1/search_path.hpp>
+#else
 #include <boost/process.hpp>
 #endif
+#endif
 
 namespace Slic3r {
 namespace GUI {