diff --git a/src/ext/cmd.cpp b/src/ext/cmd.cpp
index ffb59727..463e9ed3 100644
--- a/src/ext/cmd.cpp
+++ b/src/ext/cmd.cpp
@@ -31,7 +31,7 @@
 #endif
 #endif
 
-#if (defined(__linux__) || defined(__ANDROID__))
+#if (defined(__linux__) || defined(__ANDROID__) || defined(__gnu_hurd__))
 #include <cstdio>
 #endif
 
@@ -211,7 +211,7 @@ shell cmd(boost::process::v2::pid_type pid, error_code & ec)
     return make_cmd_shell_::make(std::move(procargs), argc, argv.release(), fr_func);
 }
     
-#elif (defined(__linux__) || defined(__ANDROID__))
+#elif (defined(__linux__) || defined(__ANDROID__) || defined(__gnu_hurd__))
 
 shell cmd(boost::process::v2::pid_type pid, error_code & ec)
 {
diff --git a/src/ext/env.cpp b/src/ext/env.cpp
index 2f215250..41fcc9ac 100644
--- a/src/ext/env.cpp
+++ b/src/ext/env.cpp
@@ -246,7 +246,7 @@ env_view env(boost::process::v2::pid_type pid, error_code & ec)
 	return {};
 }
 
-#elif (defined(__APPLE___) || defined(__MACH__)) && !TARGET_OS_IOS
+#elif (defined(__APPLE__) && defined(__MACH__)) && !TARGET_OS_IOS
 
 env_view env(boost::process::v2::pid_type pid, error_code & ec)
 {
@@ -309,7 +309,7 @@ env_view env(boost::process::v2::pid_type pid, error_code & ec)
     return ev;
 }
 
-#elif (defined(__linux__) || defined(__ANDROID__))
+#elif (defined(__linux__) || defined(__ANDROID__)) || defined(__gnu_hurd__)
 
 env_view env(boost::process::v2::pid_type pid, error_code & ec)
 {