diff -ur light-1.2.orig/src/helpers.c light-1.2/src/helpers.c
--- light-1.2.orig/src/helpers.c	2018-09-23 20:51:11.000000000 +0200
+++ light-1.2/src/helpers.c	2020-09-01 16:31:59.401674083 +0200
@@ -9,6 +9,8 @@
 #include <errno.h> // errno
 #include <libgen.h> // dirname 
 
+light_loglevel_t light_loglevel;
+
 
 bool light_file_read_uint64(char const *filename, uint64_t *val)
 {
diff -ur light-1.2.orig/src/helpers.h light-1.2/src/helpers.h
--- light-1.2.orig/src/helpers.h	2018-09-23 20:51:11.000000000 +0200
+++ light-1.2/src/helpers.h	2020-09-01 16:31:47.304750289 +0200
@@ -21,7 +21,7 @@
     LIGHT_NOTE_LEVEL
 } light_loglevel_t;
 
-light_loglevel_t light_loglevel;
+extern light_loglevel_t light_loglevel;
 
 #define LIGHT_LOG(lvl, fp, fmt, args...)\
     if (light_loglevel >= lvl)\