From c793417a3cbeec3c45b692d43664d3079ace8d1e Mon Sep 17 00:00:00 2001
From: James Zern <jzern@google.com>
Date: Thu, 6 Jul 2017 12:15:38 -0700
Subject: [PATCH] cmake: disable gif2webp if gif lib isn't found

Change-Id: I218d5c0e3f4a82905c743705382cf02d26b29e6d
---
 CMakeLists.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 522df1c3..93c9c56d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -215,6 +215,10 @@ if(WEBP_BUILD_CWEBP)
   install(TARGETS cwebp RUNTIME DESTINATION bin)
 endif()
 
+if(WEBP_BUILD_GIF2WEBP AND NOT GIF_FOUND)
+  unset(WEBP_BUILD_GIF2WEBP CACHE)
+endif()
+
 if(WEBP_BUILD_GIF2WEBP OR WEBP_BUILD_IMG2WEBP)
   parse_Makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/src/mux "WEBP_MUX_SRCS"
     "")