diff --git a/configure.ac b/configure.ac
index 318986b4e2..282905a0fc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -94,8 +94,6 @@ AC_SUBST(LIBPSAPI)
 AC_CHECK_LIB(gdi32, main)
 AC_CHECK_LIB(ole32, main)
 
-LYX_USE_INCLUDED_BOOST
-
 ### we need to know the byte order for unicode conversions
 AC_C_BIGENDIAN
 
@@ -276,23 +274,9 @@ extern "C"
 char * strerror(int n);
 #endif
 
-#define BOOST_USER_CONFIG <config.h>
-
-#if !defined(ENABLE_ASSERTIONS)
-#  define BOOST_DISABLE_ASSERTS 1
-#endif
-#define BOOST_ENABLE_ASSERT_HANDLER 1
-
-#define BOOST_DISABLE_THREADS 1
-#define BOOST_NO_WREGEX 1
-#define BOOST_NO_WSTRING 1
-
 #ifdef __CYGWIN__
 #  define _DEFAULT_SOURCE
 #  define NOMINMAX
-#  define BOOST_POSIX 1
-#  define BOOST_POSIX_API 1
-#  define BOOST_POSIX_PATH 1
 #endif
 
 #ifdef __sparc__
@@ -333,7 +317,6 @@ AC_DEFINE_UNQUOTED([LYX_RELEASE_PATCH],$lyx_patch,[Patch version number])
 AC_CONFIG_FILES([Makefile \
       lyx.1:lyx.1in \
       3rdparty/Makefile \
-      3rdparty/boost/Makefile \
       3rdparty/dtl/Makefile \
       3rdparty/hunspell/Makefile \
       3rdparty/mythes/Makefile \