+#if defined (USE_MACOSX_PACKAGING)
+namespace {
+ // Unexposed--extract an environment variable name from its NAME=VALUE
+ // representation
+ std::string varname(const char* line)
+ {
+ size_t nameLen = strcspn(line, "=");
+ if (nameLen == strlen(line)) {
+ return std::string();
+ } else {
+ return std::string(line, nameLen);
+ }
+ }
+}
+
+void cleanDuplicateEnvVars()
+{
+ std::set<std::string> seen;
+ std::set<std::string> dupes;
+
+ // Create a list of the environment variables that appear more than once
+ for (char **read = *_NSGetEnviron(); *read; read++) {
+ std::string name = varname(*read);
+ if (name.size() == 0) {
+ continue;
+ }
+ if (seen.find(name) != seen.end()) {
+ dupes.insert(name);
+ } else {
+ seen.insert(name);
+ }
+ }
+
+ // Loop over the list of duplicated variables
+ std::set<std::string>::iterator dupe = dupes.begin();
+ std::set<std::string>::iterator const dend = dupes.end();
+ for (; dupe != dend; ++dupe) {
+ const char *name = (*dupe).c_str();
+ char *val = getenv(name);
+ if (val != NULL) {
+ LYXERR(Debug::INIT, "Duplicate environment variable: " << name);
+ // unsetenv removes *all* instances of the variable from the environment
+ unsetenv(name);
+
+ // replace with the value from getenv (in practice appears to be the
+ // first value in the list)
+ setenv(name, val, 0);
+ }
+ }
+}
+#endif