https://bugs.gentoo.org/852182
--- a/src/tests/tag/tag_perf.cpp
+++ b/src/tests/tag/tag_perf.cpp
@@ -20,6 +20,7 @@ using namespace gloox;
 #include <cstdlib>
 #include <string>
 #include <cstdio> // [s]print[f]
+#include <ctime>
 
 #include <sys/time.h>
 
--- a/src/tests/zlib/zlib_perf.cpp
+++ b/src/tests/zlib/zlib_perf.cpp
@@ -24,6 +24,7 @@ using namespace gloox;
 #include <string>
 #include <sys/time.h>
 #include <cstdio> // [s]print[f]
+#include <ctime>
 
 #ifdef HAVE_ZLIB