From 26838cd087dfb91edaf49d05fbaafae7addf692a Mon Sep 17 00:00:00 2001
From: Tamas Kenez <address@hidden>
Date: Mon, 23 Nov 2015 01:43:42 +0100
Subject: [PATCH] [cmake] add WITH_* variables to force/auto/omit
 ZLIB/BZip2/PNG/HarfBuzz

---
 CMakeLists.txt | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1a96ef6..c46bc24 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -58,6 +58,14 @@
 #
 # . `CMakeLists.txt' is provided as-is since it is normally not used by the
 #   developer team.
+#
+# . Set the `WITH_ZLIB`, `WITH_BZip2`, `WITH_PNG` and `WITH_HarfBuzz`
+#   CMake variables to `ON` or `OFF` to force or skip using a dependency.
+#   Leave a variable undefined (default) to use the dependency only if
+#   it's available. Example:
+#
+#     cmake ... -DWITH_ZLIB=ON -DWITH_HarfBuzz=OFF ...
+#
 
 
 cmake_minimum_required(VERSION 2.6)
@@ -150,10 +158,19 @@ add_definitions(-DFT2_BUILD_LIBRARY)
 
 
 # Find dependencies
-find_package(ZLIB)
-find_package(BZip2)
-find_package(PNG)
-find_package(HarfBuzz)
+foreach(d ZLIB BZip2 PNG HarfBuzz)
+  string(TOUPPER "${d}" D)
+  if (DEFINED WITH_${d} OR DEFINED WITH_${D})
+    if (WITH_${d} OR WITH_${D})
+      find_package(${d} QUIET REQUIRED)
+    endif()
+  else()
+    find_package(${d} QUIET)
+  endif()
+  if (${d}_FOUND OR ${D}_FOUND)
+    message(STATUS "Building with ${d}")
+  endif()
+endforeach()
 
 
 message(STATUS
-- 
2.6.2