diff -r 7afc121e0689 -r ed54c0d13df0 m4/lx_check_glpk.m4
--- a/m4/lx_check_glpk.m4	Tue Dec 02 21:40:33 2008 +0100
+++ b/m4/lx_check_glpk.m4	Tue Dec 02 22:48:28 2008 +0100
@@ -42,6 +42,11 @@
       #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;