diff --git a/configure.in b/configure.in
index 56f5abf..1231c4f 100755
--- a/configure.in
+++ b/configure.in
@@ -19,7 +19,7 @@ AX_CXX_COMPILE_STDCXX(17,noext,mandatory)
 AC_LANG([C++])
 
 # Checks for header files.
-AX_BOOST_BASE(["1.71"],[], AC_MSG_ERROR([SBGraph needs boost library.]))
+# AX_BOOST_BASE(["1.71"],[], AC_MSG_ERROR([SBGraph needs boost library.]))
 AC_FUNC_ALLOCA
 AC_CHECK_HEADERS([malloc.h stdlib.h string.h unistd.h])
 
diff --git a/sbg/sbg.hpp b/sbg/sbg.hpp
index 8bdb2db..aae650e 100755
--- a/sbg/sbg.hpp
+++ b/sbg/sbg.hpp
@@ -50,8 +50,6 @@ struct SBGraph {
 template<typename Set>
 std::ostream &operator<<(std::ostream &out, const SBGraph<Set> &pw);
 
-template<typename Set>
-void addSV(Set vertices, SBGraph<Set> &g);
 
 template<typename Set>
 unsigned int nmbrSV(SBGraph<Set> g);
@@ -59,6 +57,12 @@ unsigned int nmbrSV(SBGraph<Set> g);
 template<typename Set>
 void addSE(Set edges, SBGraph<Set> &g);
 
+template<typename Set>
+SBGraph<Set> addSE(PWMap<Set> pw1, PWMap<Set> pw2, SBGraph<Set> g);
+
+template<typename Set>
+SBGraph<Set> addSV(Set vertices, SBGraph<Set> g);
+
 template<typename Set>
 SBGraph<Set> copy(unsigned int times, SBGraph<Set> g);