Index: lldb/CMakeLists.txt
===================================================================
--- lldb/CMakeLists.txt
+++ lldb/CMakeLists.txt
@@ -221,7 +221,7 @@
 
   # Install the LLDB python module
   if(LLDB_BUILD_FRAMEWORK)
-    set(LLDB_PYTHON_INSTALL_PATH ${LLDB_FRAMEWORK_INSTALL_DIR}/LLDB.framework/Resources/Python)
+    set(LLDB_PYTHON_INSTALL_PATH ${LLDB_FRAMEWORK_INSTALL_PATH}/LLDB.framework/Resources/Python)
   else()
     set(LLDB_PYTHON_INSTALL_PATH ${LLDB_PYTHON_RELATIVE_PATH})
   endif()
Index: lldb/cmake/modules/AddLLDB.cmake
===================================================================
--- lldb/cmake/modules/AddLLDB.cmake
+++ lldb/cmake/modules/AddLLDB.cmake
@@ -218,7 +218,7 @@
     set(subdir LLDB.framework/Versions/${LLDB_FRAMEWORK_VERSION}/Resources)
     add_lldb_executable(${name}
       GENERATE_INSTALL
-      INSTALL_PREFIX ${LLDB_FRAMEWORK_INSTALL_DIR}/${subdir}
+      INSTALL_PREFIX ${LLDB_FRAMEWORK_INSTALL_PATH}/${subdir}
       ${ARG_UNPARSED_ARGUMENTS}
     )
     lldb_add_to_buildtree_lldb_framework(${name} ${subdir})
Index: lldb/cmake/modules/LLDBConfig.cmake
===================================================================
--- lldb/cmake/modules/LLDBConfig.cmake
+++ lldb/cmake/modules/LLDBConfig.cmake
@@ -90,7 +90,9 @@
 
   set(LLDB_FRAMEWORK_VERSION A CACHE STRING "LLDB.framework version (default is A)")
   set(LLDB_FRAMEWORK_BUILD_DIR bin CACHE STRING "Output directory for LLDB.framework")
+  set(LLDB_FRAMEWORK_INSTALL_PREFIX "" CACHE STRING "Prefix for the LLDB.framework install directory")
   set(LLDB_FRAMEWORK_INSTALL_DIR Library/Frameworks CACHE STRING "Install directory for LLDB.framework")
+  set(LLDB_FRAMEWORK_INSTALL_PATH "${LLDB_FRAMEWORK_INSTALL_PREFIX}${LLDB_FRAMEWORK_INSTALL_DIR}")
 
   get_filename_component(LLDB_FRAMEWORK_ABSOLUTE_BUILD_DIR ${LLDB_FRAMEWORK_BUILD_DIR} ABSOLUTE
     BASE_DIR ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR})
Index: lldb/cmake/modules/LLDBFramework.cmake
===================================================================
--- lldb/cmake/modules/LLDBFramework.cmake
+++ lldb/cmake/modules/LLDBFramework.cmake
@@ -1,5 +1,5 @@
 message(STATUS "LLDB.framework: build path is '${LLDB_FRAMEWORK_ABSOLUTE_BUILD_DIR}'")
-message(STATUS "LLDB.framework: install path is '${LLDB_FRAMEWORK_INSTALL_DIR}'")
+message(STATUS "LLDB.framework: install path is '${LLDB_FRAMEWORK_INSTALL_PATH}'")
 message(STATUS "LLDB.framework: resources subdirectory is 'Versions/${LLDB_FRAMEWORK_VERSION}/Resources'")
 
 # Configure liblldb as a framework bundle
@@ -27,7 +27,7 @@
   LIBRARY_DIR ${LLDB_FRAMEWORK_ABSOLUTE_BUILD_DIR}
 )
 
-lldb_add_post_install_steps_darwin(liblldb ${LLDB_FRAMEWORK_INSTALL_DIR})
+lldb_add_post_install_steps_darwin(liblldb ${LLDB_FRAMEWORK_INSTALL_PATH})
 
 # Affects the layout of the framework bundle (default is macOS layout).
 if(IOS)
Index: lldb/source/API/CMakeLists.txt
===================================================================
--- lldb/source/API/CMakeLists.txt
+++ lldb/source/API/CMakeLists.txt
@@ -15,7 +15,7 @@
 endif()
 
 if(LLDB_BUILD_FRAMEWORK)
-  set(option_install_prefix INSTALL_PREFIX ${LLDB_FRAMEWORK_INSTALL_DIR})
+  set(option_install_prefix INSTALL_PREFIX ${LLDB_FRAMEWORK_INSTALL_PATH})
   set(option_framework FRAMEWORK)
 endif()