--- rstudio-1.2.1335-orig/src/cpp/desktop/CMakeLists.txt	2019-03-28 16:08:20.000000000 +1100
+++ rstudio-1.2.1335/src/cpp/desktop/CMakeLists.txt	2019-04-09 18:04:57.783616412 +1000
@@ -140,6 +140,13 @@
 get_filename_component(QT_LIBRARY_PATH "${QT_BIN_DIR}/../lib"     ABSOLUTE CACHE)
 get_filename_component(QT_INSTALL_PATH "${QT_BIN_DIR}/.."         ABSOLUTE CACHE)
 
+find_path(QTSINGLEAPPLIB_INCLUDE_DIR NAMES QtSingleApplication
+  PATH_SUFFIXES QtSolutions
+  PATHS
+  /usr/include/qt5)
+find_library(QTSINGLEAPPLIB Qt5Solutions_SingleApplication-2.6
+  libQt5Solutions_SingleApplication-2.6)
+
 # disable clang warnings for qt sources
 if(APPLE)
    add_definitions(-Wno-unused-private-field
@@ -158,7 +165,6 @@
 
 set(MOC_DESKTOP_HEADER_FILES ${DESKTOP_HEADER_FILES})
 list(REMOVE_ITEM MOC_DESKTOP_HEADER_FILES
-  ${CMAKE_CURRENT_SOURCE_DIR}/3rdparty/qtsingleapplication/qtlockedfile.h
   ${CMAKE_CURRENT_SOURCE_DIR}/DesktopDetectRHome.hpp
   ${CMAKE_CURRENT_SOURCE_DIR}/DesktopOptions.hpp
   ${CMAKE_CURRENT_SOURCE_DIR}/DesktopRVersion.hpp
@@ -224,8 +230,6 @@
   DesktopSlotBinders.cpp
   DesktopSubMenu.cpp
   DesktopSynctex.cpp
-  3rdparty/qtsingleapplication/qtsingleapplication.cpp
-  3rdparty/qtsingleapplication/qtlocalpeer.cpp
 )
 
 if(WIN32)
@@ -280,6 +284,7 @@
   ${CORE_SOURCE_DIR}/include
   ${CMAKE_CURRENT_SOURCE_DIR}
   ${CMAKE_CURRENT_BINARY_DIR}
+  ${QTSINGLEAPPLIB_INCLUDE_DIR}
   ${TESTS_INCLUDE_DIR}
 )
 
@@ -384,6 +389,7 @@
    # set link dependencies
    target_link_libraries(rstudio
       ${RSTUDIO_QTMODULES}
+      ${QTSINGLEAPPLIB}
       ${QT_LIBRARIES}
       ${Boost_LIBRARIES}
       rstudio-core
--- rstudio-1.2.1335-orig/src/cpp/desktop/DesktopPosixApplication.hpp	2019-03-28 16:08:20.000000000 +1100
+++ rstudio-1.2.1335/src/cpp/desktop/DesktopPosixApplication.hpp	2019-04-09 18:01:39.333920927 +1000
@@ -16,7 +16,7 @@
 #ifndef DESKTOP_POSIX_APPLICATION_HPP
 #define DESKTOP_POSIX_APPLICATION_HPP
 
-#include "3rdparty/qtsingleapplication/QtSingleApplication"
+#include <QtSingleApplication>
 
 #include "DesktopApplicationLaunch.hpp"