X-Git-Url: https://git.lyx.org/gitweb/?a=blobdiff_plain;f=3rdparty%2Fboost%2Flibs%2Fregex%2Fsrc%2Fw32_regex_traits.cpp;h=5b5236aa884cd382df25623162ca977ff1fa4afd;hb=09130d7a622;hp=0f825702477ff981e5e16cf1fa4b38a16486faef;hpb=294969c6a2ba456c231e52d79b4637cdd50a6a95;p=lyx.git

diff --git a/3rdparty/boost/libs/regex/src/w32_regex_traits.cpp b/3rdparty/boost/libs/regex/src/w32_regex_traits.cpp
index 0f82570247..5b5236aa88 100644
--- a/3rdparty/boost/libs/regex/src/w32_regex_traits.cpp
+++ b/3rdparty/boost/libs/regex/src/w32_regex_traits.cpp
@@ -23,7 +23,9 @@
 #include <boost/regex/regex_traits.hpp>
 #include <boost/regex/pattern_except.hpp>
 
-#define WIN32_LEAN_AND_MEAN
+#ifndef WIN32_LEAN_AND_MEAN
+#  define WIN32_LEAN_AND_MEAN
+#endif
 #ifndef NOMINMAX
 #  define NOMINMAX
 #endif