diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index d01cea48057..84a120b4f09 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -1586,7 +1586,10 @@ AC_CONFIG_FILES([llvm.spec])
 
 dnl Configure doxygen's configuration file
 AC_CONFIG_FILES([docs/doxygen.cfg])
+
+dnl Configure clang, if present
 if test -f ${srcdir}/tools/clang/README.txt; then
+  AC_CONFIG_HEADERS([tools/clang/include/clang/Config/config.h])
   AC_CONFIG_FILES([tools/clang/docs/doxygen.cfg])
 fi
 
diff --git a/configure b/configure
index 402dc4eb6b4..1c790c51b8f 100755
--- a/configure
+++ b/configure
@@ -21095,6 +21095,7 @@ ac_config_files="$ac_config_files llvm.spec"
 ac_config_files="$ac_config_files docs/doxygen.cfg"
 
 if test -f ${srcdir}/tools/clang/README.txt; then
+  ac_config_headers="$ac_config_headers tools/clang/include/clang/Config/config.h"
   ac_config_files="$ac_config_files tools/clang/docs/doxygen.cfg"
 
 fi