diff --git a/.azure-pipelines.yml b/.azure-pipelines.yml
index c1e2dcbb..3e67e05a 100644
--- a/.azure-pipelines.yml
+++ b/.azure-pipelines.yml
@@ -115,7 +115,7 @@ steps:
     set -xue
     export CMAKE_BUILD_PARALLEL_LEVEL="$(${NPROC_COMMAND:-nproc})"
     echo "${CMAKE_BUILD_PARALLEL_LEVEL}"
-    cmake_args=(-G"${CMAKE_GENERATOR:-Ninja}")
+    cmake_args=(-G"${CMAKE_GENERATOR:-Ninja}" -DUSE_WERROR=ON)
     if [ -n "${TOOLCHAIN_FILE:-}" ]; then
         cmake_args+=(-DCMAKE_TOOLCHAIN_FILE="${TOOLCHAIN_FILE}")
     fi
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2ca66e60..e67ee3df 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -88,6 +88,11 @@ option(USE_LTO "Enable link-time optimization" OFF)
 # Enabling fast math makes generated images less likely to be reproducible.
 # See https://github.com/DaemonEngine/crunch/issues/29
 option(USE_FAST_MATH "Enable fast math (generated images are less likely to be reproducible)" OFF)
+# Enabling -Werror makes every warnings fatal.
+option(USE_WERROR "Tell the compiler to make the build fail when warnings are present" OFF)
+# Ignoring known warning from third-party vendored libs makes possible to reduce the scope of
+# -Werror on crunch.
+option(IGNORE_VENDORED_WARNING "Ignore known warning from vendored lib (not our fault!)" ON)
 
 if (BUILD_STATIC_LIBCRN)
 	option(INSTALL_STATIC_LIBCRN "Install static libraries" OFF)
@@ -97,6 +102,10 @@ if (MSVC)
 	# Enable MSVC parallel compilation.
 	set_c_cxx_flag("/MP")
 
+	if (USE_WERROR)
+		try_c_cxx_flag(WARNINGS "/WX")
+	endif()
+
 	# MSVC doesn't implement strict aliasing so there is nothing else to do.
 	
 	# CMake already sets the /O2 flag on Release and RelWithDebInfo build and /O[1-2] already sets the /Oy flag.
@@ -121,6 +130,10 @@ if (MSVC)
 		set_linker_flag("/LTCG" MINSIZEREL)
 	endif()
 else()
+	if (USE_WERROR)
+		try_c_cxx_flag(WARNINGS "-Werror")
+	endif()
+
 	# As written in crnlib.h and stb_image.h, strict aliasing should always be disabled.
 	set_c_cxx_flag("-fno-strict-aliasing")
 
diff --git a/crnlib/CMakeLists.txt b/crnlib/CMakeLists.txt
index 4d797361..bca42d04 100644
--- a/crnlib/CMakeLists.txt
+++ b/crnlib/CMakeLists.txt
@@ -2,6 +2,8 @@ include_directories(
   ${CMAKE_CURRENT_SOURCE_DIR}/../inc
 )
 
+add_subdirectory(lzma)
+
 # Defines the source code for the library
 set(CRNLIB_SRCS
   ${CMAKE_CURRENT_SOURCE_DIR}/crn_arealist.cpp
@@ -147,102 +149,12 @@ set(CRNLIB_SRCS
   ${CMAKE_CURRENT_SOURCE_DIR}/../inc/crn_decomp.h
   ${CMAKE_CURRENT_SOURCE_DIR}/../inc/crnlib.h
   ${CMAKE_CURRENT_SOURCE_DIR}/../inc/dds_defs.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/7zAlloc.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/7zAlloc.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/7zArcIn.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/7zBuf2.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/7zBuf.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/7zBuf.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/7zCrc.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/7zCrc.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/7zCrcOpt.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/7zDec.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/7zFile.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/7zFile.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/7z.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/7zStream.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/7zTypes.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/7zVersion.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/7zWindows.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Aes.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Aes.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/AesOpt.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Alloc.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Alloc.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Bcj2.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Bcj2Enc.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Bcj2.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Bra86.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Bra.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Bra.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/BraIA64.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Compiler.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/CpuArch.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/CpuArch.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Delta.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Delta.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/DllSecur.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/DllSecur.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/LzFind.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/LzFind.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/LzFindMt.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/LzFindMt.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/LzFindOpt.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/LzHash.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Lzma2Dec.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Lzma2Dec.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Lzma2DecMt.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Lzma2DecMt.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Lzma2Enc.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Lzma2Enc.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Lzma86Dec.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Lzma86Enc.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Lzma86.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/LzmaDec.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/LzmaDec.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/LzmaEnc.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/LzmaEnc.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/LzmaLib.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/LzmaLib.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/MtCoder.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/MtCoder.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/MtDec.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/MtDec.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Ppmd7.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Ppmd7Dec.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Ppmd7Enc.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Ppmd7.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Ppmd.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Precomp.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/RotateDefs.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Sha256.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Sha256.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Sha256Opt.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Sort.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Sort.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/SwapBytes.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/SwapBytes.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Threads.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Threads.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Xz.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/XzCrc64.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/XzCrc64.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/XzCrc64Opt.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/XzDec.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/XzEnc.c
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/XzEnc.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Xz.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/lzma/XzIn.c
 )
 
 if(WIN32)
   set(CRNLIB_THREAD_SRCS
     ${CMAKE_CURRENT_SOURCE_DIR}/crn_threading_win32.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/crn_threading_win32.h
-    ${CMAKE_CURRENT_SOURCE_DIR}/lzma/LzFindMt.c
-    ${CMAKE_CURRENT_SOURCE_DIR}/lzma/LzFindMt.h
-    ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Threads.c
-    ${CMAKE_CURRENT_SOURCE_DIR}/lzma/Threads.h
   )
 else()
   set(CRNLIB_THREAD_SRCS
@@ -265,7 +177,9 @@ else()
   set(CRUNCH_OTHER_LIBRARY_SUFFIX -shared)
 endif()
 
-add_library(${CRUNCH_LIBRARY_NAME} ${CRUNCH_DEFAULT_LIBRARY_TYPE} $<TARGET_OBJECTS:${CRUNCH_OBJECT_NAME}>)
+set(CRUNCH_TARGET_OBJECTS $<TARGET_OBJECTS:${CRUNCH_OBJECT_NAME}> $<TARGET_OBJECTS:${LZMA_OBJECT_NAME}>)
+
+add_library(${CRUNCH_LIBRARY_NAME} ${CRUNCH_DEFAULT_LIBRARY_TYPE} ${CRUNCH_TARGET_OBJECTS})
 set_property(TARGET ${CRUNCH_LIBRARY_NAME} PROPERTY POSITION_INDEPENDENT_CODE 1)
 
 if (BUILD_SHARED_LIBS OR (BUILD_STATIC_LIBCRN AND INSTALL_STATIC_LIBCRN))
@@ -275,7 +189,7 @@ endif()
 if ((BUILD_SHARED_LIBS AND BUILD_STATIC_LIBCRN) OR (NOT BUILD_SHARED_LIBS AND BUILD_SHARED_LIBCRN))
   set(CRUNCH_OTHER_LIBRARY_NAME ${CRUNCH_LIBRARY_NAME}${CRUNCH_OTHER_LIBRARY_SUFFIX})
 
-  add_library(${CRUNCH_OTHER_LIBRARY_NAME} ${CRUNCH_OTHER_LIBRARY_TYPE} $<TARGET_OBJECTS:${CRUNCH_OBJECT_NAME}>)
+  add_library(${CRUNCH_OTHER_LIBRARY_NAME} ${CRUNCH_OTHER_LIBRARY_TYPE} ${CRUNCH_TARGET_OBJECTS})
   set_property(TARGET ${CRUNCH_OTHER_LIBRARY_NAME} PROPERTY POSITION_INDEPENDENT_CODE 1)
 
   if(NOT WIN32)
diff --git a/crnlib/crn_core.h b/crnlib/crn_core.h
index c1f31b03..4d3f9fde 100644
--- a/crnlib/crn_core.h
+++ b/crnlib/crn_core.h
@@ -21,7 +21,9 @@
 // Otherwise, we disable exceptions for a small speed boost.
 #define _HAS_EXCEPTIONS 0
 #endif
+#ifndef NOMINMAX
 #define NOMINMAX
+#endif
 
 #define CRNLIB_USE_WIN32_API 1
 
diff --git a/crnlib/lzma/CMakeLists.txt b/crnlib/lzma/CMakeLists.txt
new file mode 100644
index 00000000..40c279df
--- /dev/null
+++ b/crnlib/lzma/CMakeLists.txt
@@ -0,0 +1,115 @@
+set(LZMA_LIBRARY_NAME "lzma")
+
+# Defines the source code for the library.
+set(LZMALIB_SRCS
+	${CMAKE_CURRENT_SOURCE_DIR}/7zAlloc.c
+	${CMAKE_CURRENT_SOURCE_DIR}/7zAlloc.h
+	${CMAKE_CURRENT_SOURCE_DIR}/7zArcIn.c
+	${CMAKE_CURRENT_SOURCE_DIR}/7zBuf2.c
+	${CMAKE_CURRENT_SOURCE_DIR}/7zBuf.c
+	${CMAKE_CURRENT_SOURCE_DIR}/7zBuf.h
+	${CMAKE_CURRENT_SOURCE_DIR}/7zCrc.c
+	${CMAKE_CURRENT_SOURCE_DIR}/7zCrc.h
+	${CMAKE_CURRENT_SOURCE_DIR}/7zCrcOpt.c
+	${CMAKE_CURRENT_SOURCE_DIR}/7zDec.c
+	${CMAKE_CURRENT_SOURCE_DIR}/7zFile.c
+	${CMAKE_CURRENT_SOURCE_DIR}/7zFile.h
+	${CMAKE_CURRENT_SOURCE_DIR}/7z.h
+	${CMAKE_CURRENT_SOURCE_DIR}/7zStream.c
+	${CMAKE_CURRENT_SOURCE_DIR}/7zTypes.h
+	${CMAKE_CURRENT_SOURCE_DIR}/7zVersion.h
+	${CMAKE_CURRENT_SOURCE_DIR}/7zWindows.h
+	${CMAKE_CURRENT_SOURCE_DIR}/Aes.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Aes.h
+	${CMAKE_CURRENT_SOURCE_DIR}/AesOpt.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Alloc.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Alloc.h
+	${CMAKE_CURRENT_SOURCE_DIR}/Bcj2.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Bcj2Enc.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Bcj2.h
+	${CMAKE_CURRENT_SOURCE_DIR}/Bra86.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Bra.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Bra.h
+	${CMAKE_CURRENT_SOURCE_DIR}/BraIA64.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Compiler.h
+	${CMAKE_CURRENT_SOURCE_DIR}/CpuArch.c
+	${CMAKE_CURRENT_SOURCE_DIR}/CpuArch.h
+	${CMAKE_CURRENT_SOURCE_DIR}/Delta.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Delta.h
+	${CMAKE_CURRENT_SOURCE_DIR}/DllSecur.c
+	${CMAKE_CURRENT_SOURCE_DIR}/DllSecur.h
+	${CMAKE_CURRENT_SOURCE_DIR}/LzFind.c
+	${CMAKE_CURRENT_SOURCE_DIR}/LzFind.h
+	${CMAKE_CURRENT_SOURCE_DIR}/LzFindMt.c
+	${CMAKE_CURRENT_SOURCE_DIR}/LzFindMt.h
+	${CMAKE_CURRENT_SOURCE_DIR}/LzFindOpt.c
+	${CMAKE_CURRENT_SOURCE_DIR}/LzHash.h
+	${CMAKE_CURRENT_SOURCE_DIR}/Lzma2Dec.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Lzma2Dec.h
+	${CMAKE_CURRENT_SOURCE_DIR}/Lzma2DecMt.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Lzma2DecMt.h
+	${CMAKE_CURRENT_SOURCE_DIR}/Lzma2Enc.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Lzma2Enc.h
+	${CMAKE_CURRENT_SOURCE_DIR}/Lzma86Dec.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Lzma86Enc.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Lzma86.h
+	${CMAKE_CURRENT_SOURCE_DIR}/LzmaDec.c
+	${CMAKE_CURRENT_SOURCE_DIR}/LzmaDec.h
+	${CMAKE_CURRENT_SOURCE_DIR}/LzmaEnc.c
+	${CMAKE_CURRENT_SOURCE_DIR}/LzmaEnc.h
+	${CMAKE_CURRENT_SOURCE_DIR}/LzmaLib.c
+	${CMAKE_CURRENT_SOURCE_DIR}/LzmaLib.h
+	${CMAKE_CURRENT_SOURCE_DIR}/MtCoder.c
+	${CMAKE_CURRENT_SOURCE_DIR}/MtCoder.h
+	${CMAKE_CURRENT_SOURCE_DIR}/MtDec.c
+	${CMAKE_CURRENT_SOURCE_DIR}/MtDec.h
+	${CMAKE_CURRENT_SOURCE_DIR}/Ppmd7.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Ppmd7Dec.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Ppmd7Enc.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Ppmd7.h
+	${CMAKE_CURRENT_SOURCE_DIR}/Ppmd.h
+	${CMAKE_CURRENT_SOURCE_DIR}/Precomp.h
+	${CMAKE_CURRENT_SOURCE_DIR}/RotateDefs.h
+	${CMAKE_CURRENT_SOURCE_DIR}/Sha256.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Sha256.h
+	${CMAKE_CURRENT_SOURCE_DIR}/Sha256Opt.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Sort.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Sort.h
+	${CMAKE_CURRENT_SOURCE_DIR}/SwapBytes.c
+	${CMAKE_CURRENT_SOURCE_DIR}/SwapBytes.h
+	${CMAKE_CURRENT_SOURCE_DIR}/Threads.c
+	${CMAKE_CURRENT_SOURCE_DIR}/Threads.h
+	${CMAKE_CURRENT_SOURCE_DIR}/Xz.c
+	${CMAKE_CURRENT_SOURCE_DIR}/XzCrc64.c
+	${CMAKE_CURRENT_SOURCE_DIR}/XzCrc64.h
+	${CMAKE_CURRENT_SOURCE_DIR}/XzCrc64Opt.c
+	${CMAKE_CURRENT_SOURCE_DIR}/XzDec.c
+	${CMAKE_CURRENT_SOURCE_DIR}/XzEnc.c
+	${CMAKE_CURRENT_SOURCE_DIR}/XzEnc.h
+	${CMAKE_CURRENT_SOURCE_DIR}/Xz.h
+	${CMAKE_CURRENT_SOURCE_DIR}/XzIn.c
+)
+
+if (WIN32)
+	set(LZMALIB_THREAD_SRCS
+		${CMAKE_CURRENT_SOURCE_DIR}/LzFindMt.c
+		${CMAKE_CURRENT_SOURCE_DIR}/LzFindMt.h
+		${CMAKE_CURRENT_SOURCE_DIR}/Threads.c
+		${CMAKE_CURRENT_SOURCE_DIR}/Threads.h
+	)
+else()
+	set(LZMALIB_THREAD_SRCS)
+endif()
+
+# Build the library as an object.
+set(LZMA_OBJECT_NAME ${LZMA_LIBRARY_NAME}-obj)
+set(LZMA_OBJECT_NAME ${LZMA_OBJECT_NAME} PARENT_SCOPE)
+add_library(${LZMA_OBJECT_NAME} OBJECT ${LZMALIB_SRCS} ${LZMALIB_THREAD_SRCS})
+set_property(TARGET ${LZMA_OBJECT_NAME} PROPERTY POSITION_INDEPENDENT_CODE 1)
+
+if (IGNORE_VENDORED_WARNING)
+	test_c_cxx_flag(WNO_STRINGOP_OVERFLOW "-Wno-stringop-overflow")
+	if (FLAG_WNO_STRINGOP_OVERFLOW)
+		target_compile_options(${LZMA_OBJECT_NAME} PRIVATE "-Wno-stringop-overflow")
+	endif()
+endif()
diff --git a/example1/example1.cpp b/example1/example1.cpp
index ac5b3036..b37f00e0 100644
--- a/example1/example1.cpp
+++ b/example1/example1.cpp
@@ -37,7 +37,9 @@
 #if defined(_WIN32)
 // windows.h is only needed here for GetSystemInfo().
 #define WIN32_LEAN_AND_MEAN
+#ifndef NOMINMAX
 #define NOMINMAX
+#endif
 #include "windows.h"
 #elif defined(__FreeBSD__) || defined(__APPLE__)
 #include <unistd.h>
diff --git a/inc/crn_decomp.h b/inc/crn_decomp.h
index 1abb5558..fa812f81 100644
--- a/inc/crn_decomp.h
+++ b/inc/crn_decomp.h
@@ -44,7 +44,7 @@
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
-#ifndef
+#ifndef NOMINMAX
 #define NOMINMAX
 #endif
 #include "windows.h"  // only for IsDebuggerPresent(), DebugBreak(), and OutputDebugStringA()