diff --git a/bootstrap b/bootstrap
index 901141d7..c702f8e7 100755
--- a/bootstrap
+++ b/bootstrap
@@ -32,9 +32,7 @@ then
 	exit 1
 fi
 
-# automake doesn't find autoconf${AC_VER} unless this variable is
-# exported:
-export AUTOCONF
+export ACLOCAL AUTOHEADER AUTOCONF AUTOMAKE
 
 # Bootstrap the build system.