fix for compiling 2.4 opencv with xcode 5.1

platforms/ios/build_framework.py

@@ -40,6 +40,7 @@ def build_opencv(srcroot, buildroot, target, arch):
                 "-DCMAKE_BUILD_TYPE=Release " +
                 "-DCMAKE_TOOLCHAIN_FILE=%s/platforms/ios/cmake/Toolchains/Toolchain-%s_Xcode.cmake " +
                 "-DBUILD_opencv_world=ON " +
+                "-DCMAKE_C_FLAGS=\"-Wno-implicit-function-declaration\" " +
                 "-DCMAKE_INSTALL_PREFIX=install") % (srcroot, target)
     # if cmake cache exists, just rerun cmake to update OpenCV.xproj if necessary
     if os.path.isfile(os.path.join(builddir, "CMakeCache.txt")):