diff --git a/integrations/README.md b/integrations/README.md
index bff41d8..1c6de50 100644
--- a/integrations/README.md
+++ b/integrations/README.md
@@ -11,6 +11,22 @@ Below are the specific instructions for each integration requiring *little to no
 
 For more support on these integrations, or if you'd like help creating a new integration, stop by our [community section](https://www.zerotier.com/community/)!
 
+***
+## Build flags
+
+`SDK_DEBUG` - Turns on SDK activity/warning/error output. Levels of verbosity can be adjusted in `src/SDK_Debug.h`
+`SDK_DEBUG_LOGFILE` - Used in conjunction with `SDK_DEBUG`, this will write all SDK debug chatter to a log file. 
+`SDK_LWIP_DEBUG`
+`SDK_BUNDLED`
+`SDK_SERVICE`
+`SDK_SOCKS_PROXY`
+`SDK_UNITY_3D`
+``
+``
+``
+
+
+
 ***
 ## Current Integrations
 
diff --git a/make-linux.mk b/make-linux.mk
index 35ac462..d22ffb1 100644
--- a/make-linux.mk
+++ b/make-linux.mk
@@ -61,7 +61,10 @@ endif
 ifeq ($(SDK_DEBUG),1)
 	DEFS+=-DSDK_DEBUG -g
 endif
-
+# Log debug chatter to file, path is determined by environment variable ZT_SDK_LOGFILE
+ifeq ($(SDK_DEBUG_LOG_TO_FILE),1)
+	DEFS+=-DSDK_DEBUG_LOG_TO_FILE
+endif
 
 all: shared_lib check
 
@@ -110,7 +113,7 @@ tests: $(TEST_OBJDIR) $(TEST_TARGETS)
 clean:
 	rm -rf zerotier-cli zerotier-idtool
 	rm -rf build/*
-	find . -type f \( -name '*.o' -o -name '*.so' -o -name '*.o.d' -o -name '*.out' \) -delete
+	find . -type f \( -name '*.o' -o -name '*.so' -o -name '*.o.d' -o -name '*.out' -o -name '*.log' \) -delete
 	# Remove junk generated by Android builds
 	cd integrations/Android/proj; ./gradlew clean
 	rm -rf integrations/Android/proj/.gradle
diff --git a/make-mac.mk b/make-mac.mk
index 118b6d2..9ed1a83 100644
--- a/make-mac.mk
+++ b/make-mac.mk
@@ -135,7 +135,7 @@ tests: $(TEST_OBJDIR) $(TEST_TARGETS)
 clean:
 	rm -rf zerotier-cli zerotier-idtool
 	rm -rf build/*
-	find . -type f \( -name '*.o' -o -name '*.so' -o -name '*.o.d' -o -name '*.out' \) -delete
+	find . -type f \( -name '*.o' -o -name '*.so' -o -name '*.o.d' -o -name '*.out' -o -name '*.log' \) -delete
 	# android JNI lib project
 	cd integrations/android/android_jni_lib/proj; ./gradlew clean
 	rm -rf integrations/android/android_jni_lib/proj/.gradle
diff --git a/src/SDK_Debug.c b/src/SDK_Debug.c
index f38ebff..d9edcf2 100644
--- a/src/SDK_Debug.c
+++ b/src/SDK_Debug.c
@@ -42,15 +42,14 @@
 #include <fcntl.h>
 #include <sys/syscall.h>
 
-#define DEBUG_LEVEL     5 // Set this to adjust what you'd like to see in the debug traces
- 
+#define DEBUG_LEVEL     4 // Set this to adjust what you'd like to see in the debug traces 
 #define MSG_TRANSFER    1 // RX/TX specific statements
 #define MSG_ERROR       2 // Errors
 #define MSG_INFO        3 // Information which is generally useful to any user
 #define MSG_DEBUG       4 // Information which is only useful to someone debugging
 #define MSG_DEBUG_EXTRA 5 // If nothing in your world makes sense
 
-#define DEBUG_LOGFILE_PATH "/Users/Joseph/code/ztnc_logfile.txt"
+char *debug_logfile = (char*)0;
 
 void dwr(int level, const char *fmt, ... );
 
@@ -74,10 +73,18 @@ void dwr(int level, const char *fmt, ... )
 #elif defined(__APPLE__)
   pid_t tid = pthread_mach_thread_np(pthread_self());
 #endif
-  #if defined(SDK_DEBUG_WRITE_LOGFILE)
-     FILE *file = fopen(DEBUG_LOGFILE_PATH,"a");
-     vfprintf(file, fmt, ap);
+  #if defined(SDK_DEBUG_LOG_TO_FILE)
+    if(!debug_logfile) { // Try to get logfile from env
+      debug_logfile = getenv("ZT_SDK_LOGFILE");
+    }
+    if(debug_logfile) {
+      FILE *file = fopen(debug_logfile,"a");
+      vfprintf(file, fmt, ap);
+      fclose(file);
+      va_end(ap);
+    }
   #endif
+  va_start(ap, fmt);
   fprintf(stderr, "%s [tid=%7d] ", timestring, tid);
   vfprintf(stderr, fmt, ap);
   fflush(stderr);
diff --git a/src/SDK_Debug.h b/src/SDK_Debug.h
index 860cb0b..00a4c98 100644
--- a/src/SDK_Debug.h
+++ b/src/SDK_Debug.h
@@ -34,6 +34,8 @@
 #define MSG_DEBUG       4 // Information which is only useful to someone debugging
 #define MSG_DEBUG_EXTRA 5 // If nothing in your world makes sense
 
+extern char *debug_logfile;
+
 #ifdef __cplusplus
 extern "C" {
 #endif
diff --git a/src/SDK_Intercept.c b/src/SDK_Intercept.c
index ab9583d..59f667e 100644
--- a/src/SDK_Intercept.c
+++ b/src/SDK_Intercept.c
@@ -93,8 +93,7 @@ char *api_netpath;
 
     void load_symbols()
     {
-        dwr(MSG_DEBUG,"load_symbols\n");
-
+        dwr(MSG_DEBUG_EXTRA,"load_symbols\n");
 #if defined(__linux__)
         realaccept4 = dlsym(RTLD_NEXT, "accept4");
     #if !defined(__ANDROID__)
@@ -115,7 +114,6 @@ char *api_netpath;
         realrecvfrom = (int(*)(RECVFROM_SIG))dlsym(RTLD_NEXT, "recvfrom");
         realrecvmsg = (int(*)(RECVMSG_SIG))dlsym(RTLD_NEXT, "recvmsg");
     #endif
-        dwr(MSG_DEBUG,"complete\n");
     }
         
     // ------------------------------------------------------------------------------