diff --git a/m4/lx_check_glpk.m4 b/m4/lx_check_glpk.m4
deleted file mode 100644
--- a/m4/lx_check_glpk.m4
+++ /dev/null
@@ -1,84 +0,0 @@
-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="$GLPK_LIBS"
-
-    lx_glpk_test_prog='
-      extern "C" {
-      #include <glpk.h>
-      }
-
-      #if (GLP_MAJOR_VERSION < 4) \
-         || (GLP_MAJOR_VERSION == 4 && GLP_MINOR_VERSION < 33)
-      #error Supported GLPK versions: 4.33 or above
-      #endif
-
-      int main(int argc, char** argv)
-      {
-        LPX *lp;
-        lp = lpx_create_prob();
-        lpx_delete_prob(lp);
-        return 0;
-      }'
-
-    AC_LANG_PUSH(C++)
-    AC_LINK_IFELSE([$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.])
-      lx_lp_found=yes
-      AC_DEFINE([LEMON_HAVE_LP], [1], [Define to 1 if you have any LP solver.])
-      lx_mip_found=yes
-      AC_DEFINE([LEMON_HAVE_MIP], [1], [Define to 1 if you have any MIP solver.])
-      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"])
-])