diff --git a/parse_zoneinfo.c b/parse_zoneinfo.c
index f8bb9ee..f7cc40b 100644
--- a/parse_zoneinfo.c
+++ b/parse_zoneinfo.c
@@ -23,7 +23,6 @@
  * THE SOFTWARE.
  */
 
-#define _GNU_SOURCE
 #include "timelib.h"
 
 #include <sys/stat.h>
diff --git a/timelib.m4 b/timelib.m4
index 99bf9fa..050556c 100644
--- a/timelib.m4
+++ b/timelib.m4
@@ -69,6 +69,7 @@ TL_CHECK_INT_TYPE(uint32_t)
 
 dnl Check for headers needed by timelib
 AC_CHECK_HEADERS([ \
+sys/time.h \
 sys/types.h \
 inttypes.h \
 stdint.h \
diff --git a/timelib_structs.h b/timelib_structs.h
index 4256dd4..f07a104 100644
--- a/timelib_structs.h
+++ b/timelib_structs.h
@@ -35,6 +35,10 @@
 #include <sys/types.h>
 #endif
 
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+
 #if defined(HAVE_INTTYPES_H)
 #include <inttypes.h>
 #elif defined(HAVE_STDINT_H)