diff --git a/clang/tools/scan-build/CMakeLists.txt b/clang/tools/scan-build/CMakeLists.txt
--- a/clang/tools/scan-build/CMakeLists.txt
+++ b/clang/tools/scan-build/CMakeLists.txt
@@ -66,16 +66,16 @@
   endforeach()
 
   foreach(ManPage ${ManPages})
-    add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_MANDIR}/man1/${ManPage}
+    add_custom_command(OUTPUT "${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_MANDIR}/man1/${ManPage}"
                        COMMAND ${CMAKE_COMMAND} -E make_directory
-                         ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_MANDIR}/man1
+                         "${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_MANDIR}/man1"
                        COMMAND ${CMAKE_COMMAND} -E copy
-                         ${CMAKE_CURRENT_SOURCE_DIR}/man/${ManPage}
-                         ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_MANDIR}/man1/
+                         "${CMAKE_CURRENT_SOURCE_DIR}/man/${ManPage}"
+                         "${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_MANDIR}/man1/"
                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/man/${ManPage})
-    list(APPEND Depends ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_MANDIR}/man1/${ManPage})
+    list(APPEND Depends "${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_MANDIR}/man1/${ManPage}")
     install(PROGRAMS man/${ManPage}
-            DESTINATION ${CMAKE_INSTALL_MANDIR}/man1
+            DESTINATION "${CMAKE_INSTALL_MANDIR}/man1"
             COMPONENT scan-build)
   endforeach()
 
diff --git a/libcxx/include/CMakeLists.txt b/libcxx/include/CMakeLists.txt
--- a/libcxx/include/CMakeLists.txt
+++ b/libcxx/include/CMakeLists.txt
@@ -531,7 +531,7 @@
   foreach(file ${files})
     get_filename_component(dir ${file} DIRECTORY)
     install(FILES ${file}
-      DESTINATION ${LIBCXX_INSTALL_INCLUDE_DIR}/${dir}
+      DESTINATION "${LIBCXX_INSTALL_INCLUDE_DIR}/${dir}"
       COMPONENT cxx-headers
       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
     )
@@ -539,7 +539,7 @@
 
   # Install the generated __config_site.
   install(FILES ${LIBCXX_GENERATED_INCLUDE_TARGET_DIR}/__config_site
-    DESTINATION ${LIBCXX_INSTALL_INCLUDE_TARGET_DIR}
+    DESTINATION "${LIBCXX_INSTALL_INCLUDE_TARGET_DIR}"
     PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
     COMPONENT cxx-headers)
 
diff --git a/openmp/runtime/src/CMakeLists.txt b/openmp/runtime/src/CMakeLists.txt
--- a/openmp/runtime/src/CMakeLists.txt
+++ b/openmp/runtime/src/CMakeLists.txt
@@ -360,7 +360,7 @@
     install(CODE "execute_process(COMMAND \"\${CMAKE_COMMAND}\" -E copy \"${LIBOMP_LIB_FILE}\"
       \"${alias}${LIBOMP_LIBRARY_SUFFIX}\" WORKING_DIRECTORY \${CMAKE_INSTALL_PREFIX}/bin)")
     install(CODE "execute_process(COMMAND \"\${CMAKE_COMMAND}\" -E copy \"${LIBOMP_IMP_LIB_FILE}\"
-      \"${alias}${CMAKE_STATIC_LIBRARY_SUFFIX}\" WORKING_DIRECTORY \${CMAKE_INSTALL_PREFIX}/${OPENMP_INSTALL_LIBDIR})")
+      \"${alias}${CMAKE_STATIC_LIBRARY_SUFFIX}\" WORKING_DIRECTORY \"\${CMAKE_INSTALL_PREFIX}/${OPENMP_INSTALL_LIBDIR}\")")
   endforeach()
 else()
 
@@ -372,7 +372,7 @@
     foreach(alias IN LISTS LIBOMP_ALIASES)
       install(CODE "execute_process(COMMAND \"\${CMAKE_COMMAND}\" -E create_symlink \"${LIBOMP_LIB_FILE}\"
         \"${alias}${LIBOMP_LIBRARY_SUFFIX}\" WORKING_DIRECTORY
-        \$ENV{DESTDIR}\${CMAKE_INSTALL_PREFIX}/${OPENMP_INSTALL_LIBDIR})")
+        \"\$ENV{DESTDIR}\${CMAKE_INSTALL_PREFIX}/${OPENMP_INSTALL_LIBDIR}\")")
     endforeach()
   endif()
 endif()