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This was SVN commit r874.

source/lib/sysdep/unix/dir_watch_fam.cpp

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+#include "precompiled.h"
+
+#include <map>
+#include <string>
+
+#include "lib.h"
+#include "res/file.h"
+
+//#include <fam.h>
+#include <sysdep/win/wfam.h>
+
+static FAMConnection fc;
+static bool initialized;
+
+
+static std::map<intptr_t, std::string> dirs;
+
+// path: portable and relative, must add current directory and convert to native
+// better to use a cached string from rel_chdir - secure
+int dir_add_watch(const char* const path, intptr_t* const watch)
+{
+	if(!initialized)
+	{
+		CHECK_ERR(FAMOpen2(&fc, "lib_res"));
+		atexit2((void*)FAMClose, (uintptr_t)&fc);
+		initialized = true;
+	}
+
+	char n_full_path[PATH_MAX];
+	CHECK_ERR(file_make_native_path(path, n_full_path));
+
+	FAMRequest req;
+	if(FAMMonitorDirectory(&fc, n_full_path, &req, (void*)0) < 0)
+	{
+		*watch = -1;
+		debug_warn("res_watch_dir failed!");
+		return -1;	// no way of getting error code?
+	}
+
+	*watch = (intptr_t)req.reqnum;
+	dirs[*watch] = n_full_path;
+	return 0;
+}
+
+
+int dir_cancel_watch(const intptr_t watch)
+{
+	if(!initialized)
+	{
+		debug_warn("dir_cancel_watch before dir_add_watch");
+		return -1;
+	}
+
+	FAMRequest req;
+	req.reqnum = (int)watch;
+	return FAMCancelMonitor(&fc, &req);
+}
+
+
+int dir_get_changed_file(char* fn)
+{
+	if(!initialized)
+		return -1;
+
+	FAMEvent e;
+	while(FAMPending(&fc) > 0)
+		if(FAMNextEvent(&fc, &e) >= 0)
+		{
+			char n_path[PATH_MAX];
+			const char* dir = dirs[e.fr.reqnum].c_str();
+			snprintf(n_path, PATH_MAX, "%s%c%s", dir, DIR_SEP, e.filename);
+			CHECK_ERR(file_make_portable_path(n_path, fn));
+			return 0;
+		}
+
+	return 1;
+}