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"])

])