--- /dev/null
+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;