$NetBSD$
--- CMakeLists.txt.orig	2018-03-11 12:24:30.962754838 -0700
+++ CMakeLists.txt	2018-03-11 12:26:48.015890473 -0700
@@ -132,7 +132,7 @@
 
     message(STATUS "Detected GCC version 4.7+")
 
-    set(NORMAL_CXX_FLAGS "-std=gnu++11 -Wall -Werror -Wold-style-cast -pedantic-errors")
+    set(NORMAL_CXX_FLAGS "-std=gnu++11 -Wall -Werror -pedantic-errors")
     set(NORMAL_CXX_FLAGS "${NORMAL_CXX_FLAGS} -Wno-error=deprecated-declarations") # updated version of physfs is not available on some platforms so we keep using deprecated functions, see #958
     set(RELEASE_CXX_FLAGS "-O2")
     set(DEBUG_CXX_FLAGS "-g -O0")
@@ -145,7 +145,7 @@
 
     message(STATUS "Detected Clang version 3.1+")
 
-    set(NORMAL_CXX_FLAGS "-std=c++11 -Wall -Werror -Wold-style-cast -pedantic-errors")
+    set(NORMAL_CXX_FLAGS "-std=c++11 -Wall -Werror -pedantic-errors")
     set(NORMAL_CXX_FLAGS "${NORMAL_CXX_FLAGS} -Wno-error=deprecated-declarations") # updated version of physfs is not available on some platforms so we keep using deprecated functions, see #958
     set(RELEASE_CXX_FLAGS "-O2")
     set(DEBUG_CXX_FLAGS "-g -O0")