diff -u -r ../picoLisp/src/main.c ./src/main.c
--- ../picoLisp/src/main.c	2015-11-24 02:39:50.000000000 -0500
+++ ./src/main.c	2015-11-26 18:07:24.794312532 -0500
@@ -834,8 +834,10 @@
          strcpy(buf + n + 4 + strlen(nm), ".dll");
 #endif
       }
-      if (!(h = dlopen(buf, RTLD_LAZY | RTLD_GLOBAL))  ||  !(h = dlsym(h,p)))
+      if (!(h = dlopen(buf, RTLD_LAZY | RTLD_GLOBAL))  ||  !(h = dlsym(h,p))) {
+	 fprintf(stderr, "dlopen/dlsym problem: %s\n", dlerror());
          return NO;
+      }
       val(x) = box(num(h));
    }
    return YES;