diff -Naur qttools-opensource-src-5.7.1.orig/src/assistant/help/Qt5HelpConfigExtras.cmake.in qttools-opensource-src-5.7.1/src/assistant/help/Qt5HelpConfigExtras.cmake.in
--- qttools-opensource-src-5.7.1.orig/src/assistant/help/Qt5HelpConfigExtras.cmake.in	2016-11-03 09:31:16.000000000 +0100
+++ qttools-opensource-src-5.7.1/src/assistant/help/Qt5HelpConfigExtras.cmake.in	2017-02-28 16:37:20.130457615 +0100
@@ -2,11 +2,10 @@
 if (NOT TARGET Qt5::qcollectiongenerator)
     add_executable(Qt5::qcollectiongenerator IMPORTED)
 
-!!IF isEmpty(CMAKE_BIN_DIR_IS_ABSOLUTE)
-    set(imported_location \"${_qt5Help_install_prefix}/$${CMAKE_BIN_DIR}qcollectiongenerator$$CMAKE_BIN_SUFFIX\")
-!!ELSE
-    set(imported_location \"$${CMAKE_BIN_DIR}qcollectiongenerator$$CMAKE_BIN_SUFFIX\")
-!!ENDIF
+    set(imported_location \"@NIX_OUT@/$${CMAKE_BIN_DIR}qcollectiongenerator$$CMAKE_BIN_SUFFIX\")
+    if(NOT EXISTS \"${imported_location}\")
+        set(imported_location \"@NIX_DEV@/$${CMAKE_BIN_DIR}qcollectiongenerator$$CMAKE_BIN_SUFFIX\")
+    endif()
     _qt5_Help_check_file_exists(${imported_location})
 
     set_target_properties(Qt5::qcollectiongenerator PROPERTIES
@@ -17,11 +16,10 @@
 if (NOT TARGET Qt5::qhelpgenerator)
     add_executable(Qt5::qhelpgenerator IMPORTED)
 
-!!IF isEmpty(CMAKE_BIN_DIR_IS_ABSOLUTE)
-    set(imported_location \"${_qt5Help_install_prefix}/$${CMAKE_BIN_DIR}qhelpgenerator$$CMAKE_BIN_SUFFIX\")
-!!ELSE
-    set(imported_location \"$${CMAKE_BIN_DIR}qhelpgenerator$$CMAKE_BIN_SUFFIX\")
-!!ENDIF
+    set(imported_location \"@NIX_OUT@/$${CMAKE_BIN_DIR}qhelpgenerator$$CMAKE_BIN_SUFFIX\")
+    if(NOT EXISTS \"${imported_location}\")
+        set(imported_location \"@NIX_DEV@/$${CMAKE_BIN_DIR}qhelpgenerator$$CMAKE_BIN_SUFFIX\")
+    endif()
     _qt5_Help_check_file_exists(${imported_location})
 
     set_target_properties(Qt5::qhelpgenerator PROPERTIES
diff -Naur qttools-opensource-src-5.7.1.orig/src/linguist/Qt5LinguistToolsConfig.cmake.in qttools-opensource-src-5.7.1/src/linguist/Qt5LinguistToolsConfig.cmake.in
--- qttools-opensource-src-5.7.1.orig/src/linguist/Qt5LinguistToolsConfig.cmake.in	2016-11-03 09:31:16.000000000 +0100
+++ qttools-opensource-src-5.7.1/src/linguist/Qt5LinguistToolsConfig.cmake.in	2017-02-28 16:35:40.470100681 +0100
@@ -44,11 +44,10 @@
 if (NOT TARGET Qt5::lrelease)
     add_executable(Qt5::lrelease IMPORTED)
 
-!!IF isEmpty(CMAKE_BIN_DIR_IS_ABSOLUTE)
-    set(imported_location \"${_qt5_linguisttools_install_prefix}/$${CMAKE_BIN_DIR}lrelease$$CMAKE_BIN_SUFFIX\")
-!!ELSE
-    set(imported_location \"$${CMAKE_BIN_DIR}lrelease$$CMAKE_BIN_SUFFIX\")
-!!ENDIF
+    set(imported_location \"@NIX_OUT@/$${CMAKE_BIN_DIR}lrelease$$CMAKE_BIN_SUFFIX\")
+    if(NOT EXISTS \"${imported_location}\")
+        set(imported_location \"@NIX_DEV@/$${CMAKE_BIN_DIR}lrelease$$CMAKE_BIN_SUFFIX\")
+    endif()
     _qt5_LinguistTools_check_file_exists(${imported_location})
 
     set_target_properties(Qt5::lrelease PROPERTIES
@@ -59,11 +58,10 @@
 if (NOT TARGET Qt5::lupdate)
     add_executable(Qt5::lupdate IMPORTED)
 
-!!IF isEmpty(CMAKE_BIN_DIR_IS_ABSOLUTE)
-    set(imported_location \"${_qt5_linguisttools_install_prefix}/$${CMAKE_BIN_DIR}lupdate$$CMAKE_BIN_SUFFIX\")
-!!ELSE
-    set(imported_location \"$${CMAKE_BIN_DIR}lupdate$$CMAKE_BIN_SUFFIX\")
-!!ENDIF
+    set(imported_location \"@NIX_OUT@/$${CMAKE_BIN_DIR}lupdate$$CMAKE_BIN_SUFFIX\")
+    if(NOT EXISTS \"${imported_location}\")
+        set(imported_location \"@NIX_DEV@/$${CMAKE_BIN_DIR}lupdate$$CMAKE_BIN_SUFFIX\")
+    endif()
     _qt5_LinguistTools_check_file_exists(${imported_location})
 
     set_target_properties(Qt5::lupdate PROPERTIES
@@ -74,11 +72,10 @@
 if (NOT TARGET Qt5::lconvert)
     add_executable(Qt5::lconvert IMPORTED)
 
-!!IF isEmpty(CMAKE_BIN_DIR_IS_ABSOLUTE)
-    set(imported_location \"${_qt5_linguisttools_install_prefix}/$${CMAKE_BIN_DIR}lconvert$$CMAKE_BIN_SUFFIX\")
-!!ELSE
-    set(imported_location \"$${CMAKE_BIN_DIR}lconvert$$CMAKE_BIN_SUFFIX\")
-!!ENDIF
+    set(imported_location \"@NIX_OUT@/$${CMAKE_BIN_DIR}lconvert$$CMAKE_BIN_SUFFIX\")
+    if(NOT EXISTS \"${imported_location}\")
+        set(imported_location \"@NIX_DEV@/$${CMAKE_BIN_DIR}lconvert$$CMAKE_BIN_SUFFIX\")
+    endif()
     _qt5_LinguistTools_check_file_exists(${imported_location})
 
     set_target_properties(Qt5::lconvert PROPERTIES