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diff --git a/passes/cmds/plugin.cc b/passes/cmds/plugin.cc
index 3ed19497..f9534bd0 100644
--- a/passes/cmds/plugin.cc
+++ b/passes/cmds/plugin.cc
@@ -75,8 +75,27 @@ void load_plugin(std::string filename, std::vector<std::string> aliases)
#endif
void *hdl = dlopen(filename.c_str(), RTLD_LAZY|RTLD_LOCAL);
- if (hdl == NULL && orig_filename.find('/') == std::string::npos)
- hdl = dlopen((proc_share_dirname() + "plugins/" + orig_filename + ".so").c_str(), RTLD_LAZY|RTLD_LOCAL);
+ if (hdl == NULL && orig_filename.find('/') == std::string::npos) {
+ std::string install_dir = proc_share_dirname() + "plugins";
+
+ vector<string> all_dirs;
+ all_dirs.push_back(install_dir);
+
+ char* plugin_dirs = getenv("NIX_YOSYS_PLUGIN_DIRS");
+ if (plugin_dirs != NULL) {
+ std::string p(plugin_dirs), t;
+ std::stringstream ss(p);
+
+ while(std::getline(ss, t, ':')) {
+ all_dirs.push_back(t);
+ }
+ }
+
+ for (auto dir : all_dirs) {
+ hdl = dlopen((dir + "/" + orig_filename + ".so").c_str(), RTLD_LAZY|RTLD_LOCAL);
+ if (hdl != NULL) break;
+ }
+ }
if (hdl == NULL)
log_cmd_error("Can't load module `%s': %s\n", filename.c_str(), dlerror());
loaded_plugins[orig_filename] = hdl;
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