--- rstudio-1.2.5042-orig/src/cpp/core/system/PosixChildProcessTracker.cpp	2020-04-02 03:16:24.000000000 +1100
+++ rstudio-1.2.5042/src/cpp/core/system/PosixChildProcessTracker.cpp	2020-04-28 15:36:44.839368084 +1000
@@ -19,6 +19,8 @@
 
 #include <boost/format.hpp>
 
+using namespace boost::placeholders;
+
 namespace rstudio {
 namespace core {
 namespace system {
--- rstudio-1.2.5042-orig/src/cpp/core/system/PosixOutputCapture.cpp	2020-04-02 03:16:24.000000000 +1100
+++ rstudio-1.2.5042/src/cpp/core/system/PosixOutputCapture.cpp	2020-04-28 15:35:50.869185435 +1000
@@ -28,6 +28,8 @@
 
 #include <core/system/System.hpp>
 
+using namespace boost::placeholders;
+
 namespace rstudio {
 namespace core {
 namespace system {