--- a/configure
+++ b/configure
@@ -14842,7 +14842,7 @@ else
 #include <boost/version.hpp>
 boost-lib-version = BOOST_LIB_VERSION
 _ACEOF
-if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+if (eval "$ac_cpp -P conftest.$ac_ext") 2>&5 |
   tr -d '\r' |
   $SED -n -e "/^boost-lib-version = /{s///;s/\"//g;p;q;}" >conftest.i 2>&1; then :
   boost_cv_lib_version=`cat conftest.i`
--- a/m4/boost.m4
+++ b/m4/boost.m4
@@ -71,7 +71,7 @@ dnl strip `\n' with backquotes, not the
 dnl boost_cv_lib_version='1_37\r' for instance, which breaks
 dnl everything else.
 dnl Cannot use 'dnl' after [$4] because a trailing dnl may break AC_CACHE_CHECK
-(eval "$ac_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD |
+(eval "$ac_cpp -P conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD |
   tr -d '\r' |
   $SED -n -e "$1" >conftest.i 2>&1],
   [$3],