c++ - Error deriving from Boost Rational -

i'm having trouble getting compiler (g++) include header files boost c++ libraries, in subdirectory of bin directory. specifically, i'm trying include rational class header file, rational.hpp. first tried including via scripting code in makefile:

intrational.o: intrational.h     g++ -i /home/.../boost_1_58_0 -c intrational.h 

however, gives me error:

in file included testrational.cpp:11:0: intrational.h:17:1: error: expected class-name before ‘{’ token  {  ^ make: *** [testrational.o] error 1 

this intrational.h:

#ifndef _intrational_h #define _intrational_h  #include<boost/rational.hpp> //derived class class intrational: public rational {   bool simplify;   public:     void setsimple()     {       simplify=true;     };     void setnosimplify()     {       simplify=false;     };     bool getflag()     {       return simplify;     }; };   #endif // _intrational_h 

next replaced

#include<boost/rational.hpp> 

with full directory

#include</home/.../boost_1_58_0/boost/rational.hpp> 

(... represents part of directory shows identity)

this fixed first problem, have new error:

in file included intrational.h:14:0,                  testrational.cpp:11: /home/.../boost_1_58_0/boost/rational.hpp:82:78: fatal error: boost/integer/common_factor_rt.hpp: no such file or directory  #include <boost/integer/common_factor_rt.hpp> //   boost::integer::gcd, lcm 

this error originates boost library file, rational.hpp. don't want put full directory in #include, because have #include in header files referenced common_factor_rt.hpp instance, , each header file on down, lot of work. shouldn't have to, because kind of defeats purpose of using libraries.

looks want integer rational:

• specify template parameter rational<>
• qualify base class namespace (it's in boost)
• ot: don't compile header files: why have header files , .cpp files in c++?

#include <boost/rational.hpp>  // derived class class intrational : public boost::rational<int> {     bool simplify;    public:     void setsimple()     { simplify = true;  } ;     void setnosimplify() { simplify = false; } ;     bool getflag()       { return simplify;  } ; };