diff -Naur kalzium-3.5.7.orig/kalzium/src/solver/modwrap.c kalzium-3.5.7/kalzium/src/solver/modwrap.c
--- kalzium-3.5.7.orig/kalzium/src/solver/modwrap.c	2005-10-10 16:55:41.000000000 +0200
+++ kalzium-3.5.7/kalzium/src/solver/modwrap.c	2007-09-10 21:55:52.000000000 +0200
@@ -23,6 +23,7 @@
 
 #include <caml/mlvalues.h>
 #include <caml/callback.h>
+#include <caml/alloc.h>
 
 char* solve_equation(const char * eq)
 {