3 files changed, 9 insertions, 3 deletions
diff --git a/cutl/details/boost/config/platform/amigaos.hpp b/cutl/details/boost/config/platform/amigaos.hpp
index 34bcf41..6f3fec4 100644
--- a/cutl/details/boost/config/platform/amigaos.hpp
+++ b/cutl/details/boost/config/platform/amigaos.hpp
@@ -7,7 +7,9 @@
 
 #define BOOST_PLATFORM "AmigaOS"
 
-#define BOOST_DISABLE_THREADS
+#ifndef BOOST_DISABLE_THREADS
+#  define BOOST_DISABLE_THREADS
+#endif
 #define BOOST_NO_CWCHAR
 #define BOOST_NO_STD_WSTRING
 #define BOOST_NO_INTRINSIC_WCHAR_T
diff --git a/cutl/details/boost/config/platform/hpux.hpp b/cutl/details/boost/config/platform/hpux.hpp
index c35faff..84fdfa2 100644
--- a/cutl/details/boost/config/platform/hpux.hpp
+++ b/cutl/details/boost/config/platform/hpux.hpp
@@ -31,7 +31,9 @@
 #if defined(__GNUC__)
 #  if (__GNUC__ < 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ < 3))
       // GNU C on HP-UX does not support threads (checked up to gcc 3.3)
-#     define BOOST_DISABLE_THREADS
+#     ifndef BOOST_DISABLE_THREADS
+#       define BOOST_DISABLE_THREADS
+#     endif
 #  elif !defined(BOOST_DISABLE_THREADS)
       // threads supported from gcc-3.3 onwards:
 #     define BOOST_HAS_THREADS
diff --git a/cutl/details/boost/config/platform/irix.hpp b/cutl/details/boost/config/platform/irix.hpp
index b5ea887..d4add11 100644
--- a/cutl/details/boost/config/platform/irix.hpp
+++ b/cutl/details/boost/config/platform/irix.hpp
@@ -20,7 +20,9 @@
 
 #ifdef __GNUC__
    // GNU C on IRIX does not support threads (checked up to gcc 3.3)
-#  define BOOST_DISABLE_THREADS
+#  ifndef BOOST_DISABLE_THREADS
+#    define BOOST_DISABLE_THREADS
+#  endif
 #endif
 
 // boilerplate code: