Index: lldb/cmake/modules/FindCursesAndPanel.cmake
===================================================================
--- /dev/null
+++ lldb/cmake/modules/FindCursesAndPanel.cmake
@@ -0,0 +1,16 @@
+#.rst:
+# FindCursesAndPanel
+# -----------
+#
+# Find the curses and panel library as a whole.
+
+if(CURSES_INCLUDE_DIRS AND CURSES_LIBRARIES AND PANEL_LIBRARIES)
+  set(CURSES_PANEL_FOUND TRUE)
+else()
+  find_package(Curses QUIET)
+  find_library(PANEL_LIBRARIES NAMES panel DOC "The curses panel library" QUIET)
+  if(CURSES_FOUND AND PANEL_LIBRARIES)
+    mark_as_advanced(CURSES_INCLUDE_DIRS CURSES_LIBRARIES PANEL_LIBRARIES)
+  endif()
+endif()
+
Index: lldb/cmake/modules/LLDBConfig.cmake
===================================================================
--- lldb/cmake/modules/LLDBConfig.cmake
+++ lldb/cmake/modules/LLDBConfig.cmake
@@ -24,40 +24,43 @@
   set(LLDB_LINKER_SUPPORTS_GROUPS ON)
 endif()
 
+function(add_optional_dependency variable description package found)
+  set(${variable} "Auto" CACHE STRING "${description} On, Off or Auto (default)")
+  string(TOUPPER "${${variable}}" ${variable})
+
+  if("${${variable}}" STREQUAL "AUTO")
+    set(maybe_required)
+  elseif(${${variable}})
+    set(maybe_required REQUIRED)
+  else()
+    set(${variable} OFF PARENT_SCOPE)
+    return()
+  endif()
+
+  find_package(${package} ${maybe_required})
+  set(${variable} ${${found}} PARENT_SCOPE)
+endfunction()
+
+add_optional_dependency(LLDB_ENABLE_LIBEDIT "Enable editline support." LibEdit libedit_FOUND)
+add_optional_dependency(LLDB_ENABLE_CURSES "Enable curses support." CursesAndPanel CURSES_PANEL_FOUND)
+add_optional_dependency(LLDB_ENABLE_LZMA "Enable LZMA compression support." LibLZMA LIBLZMA_FOUND)
+
 set(default_enable_python ON)
-set(default_enable_libedit ON)
-set(default_enable_curses ON)
 
 # Temporary support the old LLDB_DISABLE_* variables
-if (DEFINED LLDB_DISABLE_CURSES)
-  if (LLDB_DISABLE_CURSES)
-    set(default_enable_curses OFF)
-  endif()
-endif()
 if (DEFINED LLDB_DISABLE_PYTHON)
   if (LLDB_DISABLE_PYTHON)
     set(default_enable_python OFF)
   endif()
 endif()
 
-if(DEFINED LLVM_ENABLE_LIBEDIT AND NOT LLVM_ENABLE_LIBEDIT)
-  set(default_disable_libedit ON)
-endif()
-
-if(CMAKE_SYSTEM_NAME MATCHES "Windows")
-  set(default_enable_libedit OFF)
-  set(default_enable_curses OFF)
-elseif(CMAKE_SYSTEM_NAME MATCHES "Android")
+if(CMAKE_SYSTEM_NAME MATCHES "Android")
   set(default_enable_python OFF)
-  set(default_enable_libedit OFF)
-  set(default_enable_curses OFF)
 elseif(IOS)
   set(default_enable_python OFF)
 endif()
 
 option(LLDB_ENABLE_PYTHON "Enable Python scripting integration." ${default_enable_python})
-option(LLDB_ENABLE_LIBEDIT "Enable the use of editline." ${default_enable_libedit})
-option(LLDB_ENABLE_CURSES "Enable Curses integration." ${default_enable_curses})
 option(LLDB_RELOCATABLE_PYTHON "Use the PYTHONHOME environment variable to locate Python." OFF)
 option(LLDB_USE_SYSTEM_SIX "Use six.py shipped with system and do not install a copy of it" OFF)
 option(LLDB_USE_ENTITLEMENTS "When codesigning, use entitlements if available" ON)
@@ -120,12 +123,9 @@
   add_definitions( -DHAVE_ROUND )
 endif()
 
-
+# Check if we libedit capable of handling wide characters (built with
+# '--enable-widec').
 if (LLDB_ENABLE_LIBEDIT)
-  find_package(LibEdit REQUIRED)
-
-  # Check if we libedit capable of handling wide characters (built with
-  # '--enable-widec').
   set(CMAKE_REQUIRED_LIBRARIES ${libedit_LIBRARIES})
   set(CMAKE_REQUIRED_INCLUDES ${libedit_INCLUDE_DIRS})
   check_symbol_exists(el_winsertstr histedit.h LLDB_EDITLINE_USE_WCHAR)
@@ -141,7 +141,6 @@
   set(CMAKE_EXTRA_INCLUDE_FILES)
 endif()
 
-
 # On Windows, we can't use the normal FindPythonLibs module that comes with CMake,
 # for a number of reasons.
 # 1) Prior to MSVC 2015, it is only possible to embed Python if python itself was
@@ -402,12 +401,9 @@
 set(LLDB_VERSION "${LLDB_VERSION_MAJOR}.${LLDB_VERSION_MINOR}.${LLDB_VERSION_PATCH}${LLDB_VERSION_SUFFIX}")
 message(STATUS "LLDB version: ${LLDB_VERSION}")
 
-find_package(LibLZMA)
-cmake_dependent_option(LLDB_ENABLE_LZMA "Support LZMA compression" ON "LIBLZMA_FOUND" OFF)
 if (LLDB_ENABLE_LZMA)
   include_directories(${LIBLZMA_INCLUDE_DIRS})
 endif()
-llvm_canonicalize_cmake_booleans(LLDB_ENABLE_LZMA)
 
 include_directories(BEFORE
   ${CMAKE_CURRENT_BINARY_DIR}/include
@@ -498,10 +494,10 @@
 endif()
 
 if (LLDB_ENABLE_CURSES)
-    find_package(Curses REQUIRED)
     find_library(CURSES_PANEL_LIBRARY NAMES panel DOC "The curses panel library")
     if (NOT CURSES_PANEL_LIBRARY)
-        message(FATAL_ERROR "A required curses' panel library not found.")
+      set(LLDB_ENABLE_CURSES OFF)
+      message(WARNING "Curses panel library not found.")
     endif ()
 endif ()
 
Index: lldb/test/CMakeLists.txt
===================================================================
--- lldb/test/CMakeLists.txt
+++ lldb/test/CMakeLists.txt
@@ -144,6 +144,7 @@
 # These values are not canonicalized within LLVM.
 llvm_canonicalize_cmake_booleans(
   LLDB_ENABLE_PYTHON
+  LLDB_ENABLE_LZMA
   LLVM_ENABLE_ZLIB
   LLVM_ENABLE_SHARED_LIBS
   LLDB_IS_64_BITS)