diff -up libdmtx-0.7.5/test/simple_test/simple_test.c.math libdmtx-0.7.5/test/simple_test/simple_test.c --- libdmtx-0.7.5/test/simple_test/simple_test.c.math 2018-04-06 13:19:44.000000000 +0200 +++ libdmtx-0.7.5/test/simple_test/simple_test.c 2018-04-06 13:19:52.000000000 +0200 @@ -18,6 +18,7 @@ #include <stdio.h> #include <string.h> #include <assert.h> +#include <math.h> #include <dmtx.h> int