AC_DEFUN([LX_CHECK_GLPK],

 [

   AC_ARG_WITH([glpk],

 AS_HELP_STRING([--with-glpk@<:@=PREFIX@:>@], [search for GLPK under PREFIX or under the default search paths if PREFIX is not given @<:@default@:>@])

 AS_HELP_STRING([--without-glpk], [disable checking for GLPK]),

               [], [with_glpk=yes])

   AC_ARG_WITH([glpk-includedir],

 AS_HELP_STRING([--with-glpk-includedir=DIR], [search for GLPK headers in DIR]),

               [], [with_glpk_includedir=no])

   AC_ARG_WITH([glpk-libdir],

 AS_HELP_STRING([--with-glpk-libdir=DIR], [search for GLPK libraries in DIR]),

               [], [with_glpk_libdir=no])

   lx_glpk_found=no

   if test x"$with_glpk" != x"no"; then

     AC_MSG_CHECKING([for GLPK])

     if test x"$with_glpk_includedir" != x"no"; then

       GLPK_CFLAGS="-I$with_glpk_includedir"

     elif test x"$with_glpk" != x"yes"; then

       GLPK_CFLAGS="-I$with_glpk/include"

     fi

     if test x"$with_glpk_libdir" != x"no"; then

       GLPK_LDFLAGS="-L$with_glpk_libdir"

     elif test x"$with_glpk" != x"yes"; then

       GLPK_LDFLAGS="-L$with_glpk/lib"

     fi

     GLPK_LIBS="-lglpk"

     lx_save_cxxflags="$CXXFLAGS"

     lx_save_ldflags="$LDFLAGS"

     lx_save_libs="$LIBS"

     CXXFLAGS="$GLPK_CFLAGS"

     LDFLAGS="$GLPK_LDFLAGS"

     LIBS="$GLPK_LIBS"

     lx_glpk_test_prog='

       extern "C" {

       #include <glpk.h>

       }

       int main(int argc, char** argv)

       {

         LPX *lp;

         lp = lpx_create_prob();

         lpx_delete_prob(lp);

         return 0;

       }'

     AC_LANG_PUSH(C++)

     AC_LINK_IFELSE([$lx_glpk_test_prog], [lx_glpk_found=yes], [lx_glpk_found=no])

     AC_LANG_POP(C++)

     CXXFLAGS="$lx_save_cxxflags"

     LDFLAGS="$lx_save_ldflags"

     LIBS="$lx_save_libs"

     if test x"$lx_glpk_found" = x"yes"; then

       AC_DEFINE([LEMON_HAVE_GLPK], [1], [Define to 1 if you have GLPK.])

       AC_MSG_RESULT([yes])

     else

       GLPK_CFLAGS=""

       GLPK_LDFLAGS=""

       GLPK_LIBS=""

       AC_MSG_RESULT([no])

     fi

   fi

   GLPK_LIBS="$GLPK_LDFLAGS $GLPK_LIBS"

   AC_SUBST(GLPK_CFLAGS)

   AC_SUBST(GLPK_LIBS)

   AM_CONDITIONAL([HAVE_GLPK], [test x"$lx_glpk_found" = x"yes"])

 ])